Read the scenario below. Answer the questions. Answers must be typed and in your
ID: 3204079 • Letter: R
Question
Read the scenario below. Answer the questions. Answers must be typed and in your own words. Remember to include your name! Answer sheet due at beginning of Diffusion/Osmosis lab You cannot turn in a handwritten copy or email the info to your TA- it must be a typed answer sheet. Scenario A scientist is studying the effect of temperature on fish reproduction. She measures fish reproduction as the number of baby fish produced. The scientist counts the number of baby fish in each tank at noon every day. She uses a Thermosure brand thermometer to verify temperature in each tank. What would be a possible research hypothesis? What would be the null hypothesis? What is the independent variable in this scenario? What is the dependent variable? List two standardized variables. What would be the treatment? What would be a control group for this treatment? Assume the scientist ran a t-test and received a p value of 0.120. What is the probability (in percent) that the difference between the two treatments was due to chance don't overthink this!? Based on the P-value of 0.120, would you reject the null hypothesis?Explanation / Answer
1) A possible research hypothesis would say that there is a direct correlation between the temperature of the water and the reproduction rate of the fish.
H1: The rate of reproduction of the fish is directly proportional to the temperature of the tank water.
2) The null hypothesis would speculate that there is no relation between the rate of reproduction of the fish with the temperature of the water.
H0: The rate of reproduction of the fish is not affected by the temperature of the tank water.
3) The independent variable here is the temperature of the water
4) The dependent variable here is the number of baby fish produced (or the rate of reproduction of the fish)
5) The standardized variables are the ones which remain "standard" throughout the experiement.
one standardized variable would be the brand of thermometer the scientist is using. The second standardized variable would be the volume of water in the tank. The colume of water remains constant throughout
6) A control group is used as a baseline measure. The control group is identical to all other items or subjects that you are examining with the exception that it does not receive the treatment or the experimental manipulation that the treatment group receives. For example, when examining test tubes for catalytic reactions of enzymes when added to a specific substrate, the control test tube would be identical to all other test tubes with the exception of lacking the enzyme. The treatment group is the item or subject that is manipulated. In our example, all other test tubes containing enzyme would be part of the treatment group.
So our treatement are the fishes considered for the experiement with reproduction
7) The control group would be a group of fishes which do not reproduce.
8) A p value of .120 is low enough to interpret that the null Hypothesis H0 can be rejected. It goes to say that there may be a direct correlation between temperature and reproduction rate with a 88% confidence.
9) Yes.
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