Add labels to the figure that follows, which illustrates the characteristics of research participants in control versus experimental groups.

What does it mean to say that experimental conditions are controlled? Select True or False for each statement.

T/F The test groups consist of the same individuals.

T/F The null hypothesis is correct.

T/F There is no difference in outcome between the control and experimental treatment.

T/F All physical conditions except for one are identical for all groups tested.

A controlled experiment is one that

a. Proceeds slowly enough that a scientist can make careful records of the results.

b. Tests experimental and control groups in parallel.

c. Is repeated many times to make sure the results are accurate.

d. Keeps all variables constant.

A controlled experiment is one that

a. Proceeds slowly enough that a scientist can make careful records of the results.

b. Keeps all variables constant.

c. Is repeated many times to make sure the results are accurate.

d. Tests experimental and control groups in parallel.

Control subjects in an experiment _________.

a. Should be similar in most ways to the experimental subjects.

b. Should not know whether they are in the control or experimental group.

c. Should have essentially the same interactions with the researchers as the experimental subjects.

d. Help eliminate alternative hypotheses that could explain experimental results.

e. All of the above.