Biology: Science for Life with Physiology 5th Edition by Colleen Belk Test bank
B) A high susceptibility to colds must directly cause stress.
C) People with high stress must come into contact with more cold viruses.
D) Stress might or might not affect susceptibility to colds.
Answer: D
Section: 1.2
Skill: Comprehension/Application (Understand/Apply)
Learning Outcome: 1.7
31) When is an experiment considered to be double-blind?
A) The hypothesis being tested is not based on previous observations.
B) It has already been performed by different researchers.
C) Neither the subjects nor the researchers know who is in the experimental and control groups.
D) The results of the experiment are only revealed to certain researchers.
Answer: C
Section: 1.2
Skill: Knowledge/Comprehension (Remember/Understand)
Learning Outcome: 1.6
32) Ideally, what should an experiment studying the effect of a cold medicine have?
A) no control group
B) double-blind procedures
C) a small sample size
D) subjects of only one gender
Answer: B
Section: 1.2
Skill: Comprehension (Understand)
Learning Outcome: 1.5
33) Why are correlations less convincing than controlled experimental results?
A) Correlations are subject to greater bias than experimental results.
B) Correlations cannot be observed outside the laboratory.
C) Correlations cannot be statistically significant.
D) Correlations do not eliminate as many alternative hypotheses.
Answer: D
Section: 1.2
Skill: Analysis (Analyze)
Learning Outcome: 1.7
34) Which of the following is a true statement about experimentation?
A) Variables in an experiment cannot be manipulated by the researcher.
B) Some hypotheses cannot be tested by experimentation.
C) Experimentation should test at least two or more hypotheses at the same time.
D) True randomization of subjects is impossible during experimentation.
Answer: B
Section: 1.2
Skill: Knowledge/Comprehension (Remember/Understand)
Learning Outcome: 1.5
35) A botanist conducted an experiment to test the effect of light on plants. Fifty plants of a flowering species were grown for 60 days under different lengths of artificial daylight. Flowers could be white or pink based on the parent plant genes. The amount of water and fertilizer provided was constant. At the end of the experiment, the size of each leaf for all plants is measured. What is the dependent variable in this experiment?
A) duration of artificial daylight
B) flower's color
C) leaf's size
D) duration of the experiment
Answer: C
Section: 1.2
Skill: Application (Apply)
Learning Outcome: 1.5
36) Why is the random assignment of individuals to experimental and control groups important for an experiment?
A) It ensures that bias has been completely eliminated from the experiment.
B) It ensures that the results of the experiment will be statistically significant.
C) It ensures that the sampling error will have no effect on the results of the experiment.
D) It ensures that each group will better represent the population as a whole.
Answer: D
Section: 1.2
Skill: Analysis (Analyze)
Learning Outcome: 1.6
37) When might bias in an experiment occur?
A) A subject does not know who is in the control or experimental groups.
B) A technician knows which samples are from the control group.