## Review Questions

Height and weight are positively correlated. This means that as height ________ weight ________.

- There is no relationship between height and weight.
- Usually, the taller someone is, the thinner they are.
- Usually, the shorter someone is, the heavier they are.
- As height increases, typically weight increases.

## Hint:

D

Which of the following correlation coefficients indicates the strongest relationship between two variables?

- -.90
- -.50
- +.80
- +.25

## Hint:

A

Which statement best illustrates a negative correlation between the number of hours spent watching TV the week before an exam and the grade on that exam?

- Watching too much television leads to poor exam performance.
- Smart students watch less television.
- Viewing television interferes with a student’s ability to prepare for the upcoming exam.
- Students who watch more television perform more poorly on their exams.

## Hint:

D

The correlation coefficient indicates the weakest relationship when ________.

- it is closest to 0
- it is closest to -1
- it is positive
- it is negative

## Hint:

A

________ means that everyone in the population has the same likelihood of being asked to participate in the study.

- operationalizing
- placebo effect
- random assignment
- random sampling

## Hint:

D

The ________ is controlled by the experimenter, while the ________ represents the information collected and statistically analyzed by the experimenter.

- dependent variable; independent variable
- independent variable; dependent variable
- placebo effect; experimenter bias
- experiment bias; placebo effect

## Hint:

B

Researchers must ________ important concepts in their studies so others would have a clear understanding of exactly how those concepts were defined.

- randomly assign
- randomly select
- operationalize
- generalize

## Hint:

C

Sometimes, researchers will administer a(n) ________ to participants in the control group to control for the effects that participant expectation might have on the experiment.

- dependent variable
- independent variable
- statistical analysis
- placebo

## Hint:

D