Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Textbook Question
Chapter 1, Problem 2TYK
What does it mean to say that experimental conditions are controlled?
a. The test groups consist of the same individuals.
b. The null hypothesis is correct.
c. There is no difference in outcome between the control and experimental treatment.
d. All physical conditions except for one are identical for all groups tested.
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Is the mean concentration of samples stored at one temperature statistically different from the mean concentration of samples stored at a different temperature?What type of data do you have? (highlight your chosen answer) i. One categorical ii. Two categorical iii. One numeric iv. One numeric and one categorical v. Two numeric b.What is your experimental hypothesis? c. What is your attentive hypothesis? d. What is your null hypothesis?
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In an experiment, the control group is used to:
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Change the variable
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- The purpose of the constant is to: a. allow for adjustment of the control b. eliminate other potential factors/variables in the experiment c. allow for the dependent variable to show the necessary outcome d. help prove the hypothesis correctarrow_forwarda. What was the purpose of the Griffith’s experiment? (What question was asked?) b. Briefly explain the roles of Streptococcus pneumoniae and mice (mouse) in the experimental design. To answer this question, be sure that you address the independent variables.and dependent variables. If you wish, you can sketch a labeled figure to support your answer. c. Write a complete null hypothesis for his experiment.arrow_forwardWhy the results of the Swan-neck flask experiment were reliable ?: Select one: a. Because it maintained no controls at all b. Because proper controls were maintained and only one variable changed at a time c. Because many controls were maintained d. Because it was repeatedly done by several scientists e. Because it tested all variables at the same timearrow_forward
- A valid hypothesis… (Mark any that apply.) A. should be posed as a question. B. always leads to groundbreaking results. C. can be checked by experimentation. D. is falsifiable. E. is used to decide between a small number of alternatives. choose all that applyarrow_forwardThe 'control group' is an essential component of an experiment. This is because 1. A control group allows one to determine if a particular result is due to the experimental variable. 2. No, it's not essential in experimentation. A control group is not always necessary it depends on the experiment. 3. A control group allows for multiple variables to be tested at the same time. 4. A control group is required for the development of a prediction.arrow_forwardWhat was the independent variable in the experiment? A.) Temperature B.) Seed count C.)Amount of water D.) Incubation timearrow_forward
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- What are the hypothesis, positive and negative controls of Griffith's experiment?arrow_forwardYou observe that every time your neighbor, who always wears a yellow hat, walks out his front door, he gets dive bombed by a crow. From this observation, what is a testable hypothesis? What is your prediction based on your hypothesis? Please design an experiment to test this hypothesis and prediction. You must identify the independent and dependent variables, as well as at least 2 control variables, and your experiment must contain an experimental group and a control grouparrow_forwardThe following are reasons why randomized control trials (RCTs) are not used to investigate all research questions, except: a. RCTs can be expensive, which can make it difficult if funding is limited b. RCTs can be time-consuming, and it may take months and sometimes years to obtain final results c. For certain research questions and/or certain types of exposure variables, it may not be ethical to conduct an RCT d. RCTs are less valid than observational analytical study designsarrow_forward
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