How many times do you need to repeat an experiment in order to see if your hypothesis is nearly true or not? Researchers are trying to determine if changes to . What is the independent variable for an experiment comparing different tadpole diets? Are you interested in understanding whether the new bit works in all of your wells or just specific types of ones? Biology questions and answers. ANSWER:- Tadpoles will be larger if fed a meat based diet. utilize 3-D effects to enhance the appearance of your graph, BIOLOGY LAB L100: WEEK 1: Lab Safety; Scienti, John David Jackson, Patricia Meglich, Robert Mathis, Sean Valentine, Organizational Behavior: Managing People and Organizations, Jean Phillips, Ricky W. Griffin, Stanley Gully, Bruce E. Byers, Gerald Audesirk, Teresa Audesirk, Cain, Campbell, Minorsky, Reece, Urry, Wasserman. They then collect and analyze data, seeing whether the patterns are actually present. You want to see if the meat-based diet will be associated with an increase in the average weight of the tadpoles. Experiment 1: You want to figure out which brand of microwave popcorn pops the most kernels so you can get the most value for your money. This cookie is set by GDPR Cookie Consent plugin. In your experiment you keep all other factors, such as tadpole density per pan, temperature, pH, and the amount of food the same. Number of bacteria c. generation Reproduction rate d. You want to determine if the new diet will increase the average weight of the tadpoles. In your experiment you keep all other factors, such as tadpole density per pan, temperature, pH, and the amount of food the same. which factor will you vary in order to test the hypothesis? Calculate the value for the percentage of guanine bases in the bacterium. What is the independent variable for the tadpole diet experiment? Where can you perform the experiment phase of the scientific method? Heres a more business-related example. The dependent variable (height) depends on the independent variable (age). So move out of the lab quickly.. The photo below shows a bleached coral in front and a healthy coral in back. In a graph, the independent variable is always graphed on the x-axis (horizontal, bottom one); whereas, the dependent variable is groups on the y-axis (vertical, side one). create a strategy and formulate a hypothesis. Direct link to Colin Andrews's post If each one had different, Posted 5 years ago. For example, in an experiment looking at the effects of studying on test scores, studying would be the independent variable. For Cisco an innovation is a key factor for productivity growth. Can you identify the independent and dependent variables for each of the four scenarios below? a. What is the null hypothesis the straw man youre trying to disprove? ThoughtCo. Hypothesis - create a strategy formulate a hypothesis How do you measure an independent variable? The independent variable for the tadpole diet experiment are the amount of food given to the tadpole, temperature, pH, density because an independent variable is defined as the variable that is changed or controlled in a scientific experiment .It represents the cause or the reson for an outcome (dependent variable) that is increase in the average weight. The independent variable is the amount of water given. One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. Skopped Multiple Choice Print 100 References 5 10 Goldfish will eat their eggs, or eat the fry after they hatch. An example of a dependent variable is depression symptoms, which depends on the independent variable (type of therapy). One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. As the experimenter changes the independent variable, the change in the dependent variable is observed and recorded. ** Record the breaking distance at different speeds, ** Make calculations based on the raw measurements. An easy way to think of independent and dependent variables is, when you're conducting an experiment, the independent variable is what you change, and the dependent variable is what changes because of that. Over the course of the week, you ask him to eat vegetables four times. Is a retroactive study considered legitimate if children aren't entered into the study until they are older in age? Independent and Dependent Variables: Which Is Which? These cookies will be stored in your browser only with your consent. You select 30 wells and drill 15 of them with the old bit and 15 with the new. For example, in the example above, if there were no constants and you used different amounts of water, different types of plants, different amounts of fertilizer and put the plants in windows that got different amounts of sun, you wouldn't be able to say how fertilizer type affected plant growth because there would be so many other factors potentially affecting how the plants grew. Ask below and we'll reply! For example, if we want to explore whether high concentrations of vehicle exhaust impact incidence of asthma in children, vehicle . isn't a hypothesis what your predicting will happen? The cookie is used to store the user consent for the cookies in the category "Analytics". What happened to the tenth seed? Either the scientist has to change the independent variable herself or it changes on its own; nothing else in the experiment affects or changes it. Question 2 A) diet The. Multiple Choice Tadpole size will be unpredictable if fed a meat-based diet. what is the independent variable for the tadpole diet experiment? You can also . Bleaching results in starvation, which is indicated by loss of color. For this type of study, the only choice is an instrument that queries past diet. What are the key ingredients of a controlled experiment? What is the trick to remembering the independent variable? why not test different acidity levels with different temperatures? In contrast, the dependent variable in an experiment is the response that's measured to see if the treatment had an effect. species reduced versus the reducing agent. We help companies around the world make full use of their capabilities in the areas of Microsoft Dynamics, Office 365, Power BI, and cloud-based solutions based on the Azure platform. Retrieved from https://www.thoughtco.com/definition-of-independent-variable-605238. For example, say you have ten sunflower seedlings, and you decide to give each a different amount of water each day to see if that affects their growth. The tadpoles weight will neither increase nor decrease based on the type of food they receive . You want to decide if the new diet will be associated with an increase in the average weight of the tadpoles. In this case, the fraction of bean seeds that sprouted is the dependent variable. The cookie is used to store the user consent for the cookies in the category "Performance". If each one had different temperatures, then you have too many variables. LS Retail products are used by retailers and restaurateurs in over 130 countries. What is the independent variable? Green frog tadpoles grow larger if kept in water above 18C. Control Group = Those participants treated just like the experimental group EXCEPT they are not. These cookies ensure basic functionalities and security features of the website, anonymously. Scenario 1: You buy your dog multiple brands of food to see which one is her favorite. The only difference between your control and experimental groups is the type of food the tadpoles receive. Direct link to madhoolika.chodavarapu's post Plants are PHOTOTROPIC I., Posted 3 years ago. Number of bacteria c. generation Reproduction rate d. Scenario 3: Your dentist appointment will take 30 minutes from start to finish, but that doesn't include waiting in the lounge before you're called in. carry out the strategy and collect measurements. You can also think of the independent variable as the cause and the dependent variable as the effect. They havent done the thinking, says Redman. The average weight for groups of bullfrog tadpoles is higher if density of tadpoles per gallon of water is less than 1. You can also think of the independent variable as the cause and the dependent variable as the effect. Two examples of common independent variables are age and time. The dependent variable is the effect. Question 3 Imagine that you wish to compare two different diets that will be fed to tadpoles raised in a lab. The hypothesis is: "The braking distance grows linearly with speed". 10 bean seeds are added to each pot. Analytical cookies are used to understand how visitors interact with the website. Direct link to Ivana - Science trainee's post Yes, but the hypothesis h, Posted 5 years ago. This doesn't mean that they have died - if the corals find a different nutrient-supplying species, they can regenerate and stabilize again. To test my hypothesis, I do a controlled experiment. When graphing these variables, the independent variable should go on the x-axis (the horizontal axis), and the dependent variable goes on the y-axis (vertical axis). The experiments and process should be unbiased and orderly, and the results should be repeatable. Independent Variable Definition and Examples. The only difference between your control and experimental groups is the type of food the tadpoles receive. When formulating a hypothesis, it is important to determine the scope, then pick four or five factors to focus on. Suppose your hypothesis is: "Braking distance grows linearly with speed". If the hypothesis in a scientific experiment is not supported, the experiment is considered a complete failure and must be repeated until a satisfactory outcome is reached. Excel in a world that's being continually transformed by technology. What would be natural to do in the experiment phase if the hypothesis is: " The heavier the ball, the faster it falls"? A/B can be a randomized controlled experiment, assuming youve controlled factors and randomized subjects, but not all randomized controlled experiments are A/B tests. For example, when investigating the effect of study time of performance, the study time is the independent variable. You want to know which drill is better, but other factors,such asthe size of the well, its depth, and what youre digging through, will also affecthow efficiently you drill the wellandcomplicate your evaluation of the new drill. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Some plants are negatively phototropic ( go against light) while others are positively phototropic (go towards light). Want to improve your SAT score by 160 points or your ACT score by 4 points? What is the alternative hypothesis? It depends on the independent variable! a possible explanation for a problem or observation. Tadpole Experiment 1. If they don't find new symbionts and the factors which contribute to bleaching persist, then the coral might die of starvation or disease. Below are overviews of three experiments, each with their independent and dependent variables identified. Formulating a hypothesis is the one and only thing that distinguishes a scientist from an astrologist. It's even possible for the dependent variable to remain unchanged in response to controlling the independent variable. By . The x-axis is always independent of the y-axis. The new diet is a meat-based food. Turning, Method 3 of 3: Graphing Independent and Dependent Variables. It represents the cause or reason for an outcome.Independent variables are the variables that the experimenter changes to test their dependent variable. So lets put it all together. A short example :::: Background I will narrow my topic to caregiver's rules and their relationship in developing PPD. The factor that will vary, When graphing your data, it is important to, Place the dependent variable on the X-axis What is the dependent variable for the tadpole diet experiment? Direct link to Jack Smith's post So hypotheses are like co, Posted 5 years ago. 4 How do you measure an independent variable? Direct link to Asithandile Ntsondwa's post in the results obtained h, Posted 3 years ago. Question 1 E) 10 In pillbug experiment 10 pillbugs are enough to have a good information about the experiment. One pot of seeds gets watered every afternoon. Constant variables are important because they ensure that the dependent variable is changing because, and only because, of the independent variable so you can accurately measure the relationship between the dependent and independent variables. Student test scores have no effect on the number of hours the students sleeps. B) The average weight for groups of bullfrog tadpoles is higher if density of tadpoles per gallon of . You want to see if the meat-based diet will be associated with an increase in the average weight of the tadpoles. It brings people back to those dopey science classes they didnt like, but that doesnt make the steps any less critical. Because other researchers must be able to repeat the experiment in order to check the results. One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. We include controls (positive and/or negative) in order to have something to coampare to and make conclusion). This makes it easy for you to quickly see which variable is independent and which is dependent when looking at a graph or chart. One simple way to explore independent and dependent variables is to construct a biology experiment with seeds. Imagine that you wish to compare two different diets that will be fed to tadpoles raised in a lab. -Tadpole size will be more variable if fed a meat-based diet. Suppose you have the speed on the x- axis and braking distance on the y-axis. Independent and dependent variables always go on the same places in a graph. One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. In an experiment, the variable of interest is called your dependent variable (note that you might have multiple dependent variables, but for the sake of simplicity here, Ill refer to one dependent variable). Where that data comes from and how we analyze it depends on a lot of factors for . (2008) showed that women who experience mother-in-law as a caregiver had twice the odd of PPD. The independent variable is the cause. This is important because to judge the results of your experiment, you have to ask compared to what? You dont just start drilling with the new bit and decide its better. You have to compare it against a control group in this case, the 15 wells youre digging with the old bit, which is your baseline. In the _________ phase, you will carry out the strategy you developed for testing the hypothesis. In a psychology experiment, researchers study how changes in one variable (the . She has taught science courses at the high school, college, and graduate levels. They are what stay the same throughout the experiment so you can accurately measure the impact of the independent variable on the dependent variable. let make a strategy. An example of a dependent variable is how tall you are at different ages. It looks like the "seeds need water" hypothesis is probably correct! Abstract. For example, allocating participants . 1. Necessary cookies are absolutely essential for the website to function properly. THEN ANSWER THE PRE-LAB QUESTIONS USING INFORMATION IN THIS BOOK. reasons, survey would be the alternative method. All rights reserved. Method 1 of 3: Understanding Independent and Dependent Variables. The independent variable is the item that varies through out the experiment. In your experiment you keep all other factors, such as tadpole density per pan, temperature, pH, and the amount of food the same. 4. It does not store any personal data. Experiment 3: You're interested in how rising sea temperatures impact algae life, so you design an experiment that measures the number of algae in a sample of water taken from a specific ocean site under varying temperatures. Length of the experiment b. Usually in an experiment, youre trying to learn something about one, or at most a few, independent variables, but a lot of other factors can get in the way, says Redman. Suppose you have the speed on the x axis and braking distance on the y axis, which graph would confirm the hypothesis "Braking distance is proportional to speed? False-colored map representing sea surface temperatures around the globe as different colors. They were not orienting themselves with regard to any particular stimulus. In the tadpole diet experiment, it would be sufficient to test only one single pan of tadpoles that were fed lettuce, and only one single pan of tadpoles fed meat. How scientists conduct experiments and make observations to test hypotheses. Independent and dependent variables are commonly taught in high school science classes. How many phases make up the scientific method? True, In the _________ phase, you will carry out the strategy you developed for testing the hypothesis. The independent variable for the tadpole diet experiment are the amount of food given to the tadpole, temperature, pH, density because an independent variable is defined as the variable that is changed or controlled in a scientific experiment .It represents the cause or the reson for an outcome (dependent variable) that is increase in the average However, the replication level of your experiments will have an impact on the statistical tests you can perform on your dataset (parametric or non-parametric tests, which do not have the same power). Which of these topics belongs in a scientific paper? You want to determine if the new diet will increase the average weight of the tadpoles. If you're studying how people feel about different television shows, the variables in that experiment are television shows and feelings. Direct link to Brian F's post How do the sprouting seed, Posted 4 years ago. The new diet is a meat-based food. Woodfrog tadpoles grow larger if fed a meat-based diet. Its value depends on changes in the independent variable. Multiple Choice diet lab conditions O species of tadpole O tadpole size The cookies is used to store the user consent for the cookies in the category "Necessary". For example, this program would generally predict bleaching for a particular reef when the water temperature in the reef's area exceeded its average monthly maximum by, The computer program was able to predict many bleaching events weeks or even months before they were reported, including a large bleaching event in the Great Barrier Reef in 1998, Posted 6 years ago. The dependent variable is the effect. He also advises organizations on their data and data quality programs. Is there always one independent variable and one dependent variable? Some types of hypotheses can't be tested in controlled experiments for ethical or practical reasons. The dependent variable may or may not change in response to the independent variable. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. An independent variable is defines as the variable that is changed or controlled in a scientific experiment. Although it wouldn't be the most accurate, if having someone to check if children are exposed to X or if Y is happening is not possible due to financial, privacy, etc. Which is true of the independent variable of an experiment? Accelerate your career with Harvard ManageMentor. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Dependent Variable The variable that depends on other factors that are measured. At the midpoint of the line connecting them, their combined electric field has a magnitude of 51N/C51 \mathrm{~N} / \mathrm{C}51N/C. The dependent variable is the variable that changes in response to the independent variable. Tadpoles will be larger if fed a meat-based diet. Scenario 2: Your friends invite you to a party, and you decide to attend, but you're worried that staying out too long will affect how well you do on your geometry test tomorrow morning. Check out our complete guide to winning Science Olympiad competitions. Revise the protocol based on what you learned in your pilot study. By clicking Accept All, you consent to the use of ALL the cookies. A variable is something you're trying to measure. What is the independent variable? There are different ways to title a graph, but a common way is "[Independent Variable] vs. [Dependent Variable]" like this graph. Biology. Answer. 1 What question can you ask yourself to determine the independent variable? You can use dozens of filters and search criteria to find the perfect person for your needs. Dependent Variable = What is measured or observed; the "data" collected in the experiment. Helmenstine, Anne Marie, Ph.D. (2021, July 29). The independent variable is determined by the researcher. Direct link to Companion1's post when the coral reefs are , Posted 6 years ago. Once you have a protocol, Redman suggests you do a small-scale experiment to test out whether the process youve laid out will work. There are two groups in the experiment, and they are identical except that one receives a treatment (water) while the other does not. The bigger your sample size, the more likely youll have results that are statistically significant. If an experiment were comparing five types of diets, then the independent variable (type of diet) would . The dependent variable depends on the independent variable. Direct link to Joann's post if you planted different , Posted 4 years ago. 2. How do you measure an independent variable? Can you lift more with a fixed or movable pulley? Identify independent variables: Imagine that you wish to compare the two different diets that will be fed to tadpoles raised in a lab. Direct link to 47charbrow's post how come a prediction is , Posted 3 years ago. But as far as Redman knows, theres no well-drilling lab, so you do the best you can. I put bean seeds in a pot with soil, set them on the windowsill, and wait for them to sprout. Experiment 2: You want to see which type of fertilizer helps plants grow fastest, so you add a different brand of fertilizer to each plant and see how tall they grow. experimental and control. testable. For example, in an experiment looking at the effects of studying on test scores, studying would be the independent variable. by CT Diamond. Imagine that you wish to compare two different diets that will be fed to tadpoles raised in a lab. But there are also lots of independent variables factors you suspect have an impact on your dependent variable. In your experiment you keep all other factors , such as tadpole density per pan , temperature , pH , and the amount of food the same . Independent Variable The variable that is stable and unaffected by the other variables you are trying to measure. Helmenstine, Anne Marie, Ph.D. "Independent Variable Definition and Examples." . Original hypotheses are formed after an experiment. One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. Drop different balls from a fixed height Measure the weight and the falling times of different balls. But which wells or people go into the control group and which go into the experimental group? What is the independent variable for the tadpole diet experiment ? The Capture Of The Green River Killer, Write up a research protocol, the process by which the experiment gets carried out. Researchers are trying to determine if changes to the . What are huge holes in the ground called? What SAT Target Score Should You Be Aiming For? Think through all of the factors that could spoil your experiment for example, if the drill bits are attached to different types of machines or are used in particular types of wells. The dependent variable (sometimes known as the responding variable) is what is being studied and measured in the experiment. It is called independent because its value does not depend on and is not affected by the state of any other variable in the experiment. Both contain ten bean seeds planted in the same type of soil, and both are placed in the same window. It can be a lot easier to understand the differences between these two variables with examples, so let's look at some sample experiments below. For each of the independent variables above, it's clear that they can't be changed by other variables in the experiment. In order to make smart decisions at work, we need data. Think of an independent variable as a cause that. Here are three experiments you can try at home. $$ Thus, the only possible instruments are . Imagine that you wish to compare two different diets that will be fed to tadpoles raised in a lab. Answer: The correct answer is - C. Tadpoles will be larger if fed a meat-based diet. You want to determine if the new diet will increase the average weight of the tadpoles. The cookie is used to store the user consent for the cookies in the category "Other.