1. What is a hypothesis? 2. What do the following mean in experimental design? a. Control b. Replication c. Randomization 3. You conduct an experiment where you add different amounts of protein powder to an animal’s typical food source and weigh the animals at regular intervals. a. What would be the independent variable in this experiment? b. What would be the dependent variable in this experiment? c. Write a proper If/Then statement for what you would predict to find in this experiment. BIO 112 Lab, Ball State 1 This Document Not to Be Shared or Reproduced Anywhere
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Activity 2: Experimentation Experiments are used to test a hypothesis. They are designed to consider all components, not just the variable being tested. A good experimental design will account for: Independent variable: the variable that is manipulated in the experiment, or what changes. Dependent variable: the variable that is measured to determine the effect of the independent variable, or what's measured. Standardized variables: the variables that are intentionally maintained in the experiment, or what's constant. At least two groups will be analyzed in an experiment: one control group and one experimental group. Experimental group: the group to receive the treatment or independent variable change. Control group: the group that will not receive the treatment or independent variable change, used to set a baseline or as a group to compare results to. To test our above rat hypothesis, a scientist could split same-sex rats into two groups: one that will receive chemical Y in their diet, and one that will not receive chemical Y in their diet. The rats must have standardized conditions of treatment, including the same amount of food given at the same times, the same watering amount and schedule, and kept at the same temperature in a similar enclosure. The only difference observed in the two groups should be the presence or absence of chemical Y in their diet. Given the following scenario: You know that caffeine is a stimulant, and you are curious about the effect that it has on heart rate. You design an experiment to test the effects of caffeine on the heart rate of Daphnia. You obtain 240 Daphnia and divide them into 6 groups, two beakers for each treatment, that will receive: 0%, 1%, 2%, 3%, 4%, and 5% caffeine water solution. Answer the questions below. 1) Write a hypothesis for the experiment. 2) Identify the independent variable, ... the dependent variable. 3) What are some variables you would want to remain the same during the experiment? 4) Identify the control group. Why is a control group important? 5) Why would you use two beakers for each treatment, or what is the purpose of the repetition?
Supreeta N.
1. Science is about coming up with a hypothesis and a) proving it to be true b) predicting the answer c) plotting it on a graph d) testing it 2. A/An ___________ is a tentative solution to a problem or question and should be based on background knowledge and observations. a) hypothesis b) experimental design c) theory d) scientific law 3. In an experiment, the variable that you will measure is the ____________ variable. a) independent b) hypothetical c) dependent d) strategic 4. To determine if your hypothesis is supported or not in the analysis phase, you will need to a) place experimental data in a graph and interpret it. b) create an alternative hypothesis c) record your data in a notebook d) create the strategy for your experiment
Danielle A.
C. Next, write a prediction that you would make regarding their feeding behavior, which you would use to test your hypothesis using an experiment. D. Briefly describe at least three extraneous variables that you would have to control for (i.e. variables that you are not testing for but could possibly affect the interpretation of your experiment results). These are different than the two main variables in B. E. Describe the results you would expect that would support your hypothesis. F. Describe the results that you would expect if your hypothesis is not supported.
Madhur L.
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