Professor Golder Is Studying Hyperactivity in Preschool-Age Children

question 98

Multiple Choice

Professor Golder is studying hyperactivity in preschool-age children. She is concerned that differences in child rearing, diet, and so forth may affect her results. To minimize these potential preexisting variables, she should be sure to do which of the following?

• A) Use random assignment when forming her groups.
• B) Include an independent variable.
• C) Include a dependent variable.
• D) Assign boys to the experimental group and girls to the control group.

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Definitions:

One-tailed Test

A hypothesis test where the region of rejection is on only one side of the sampling distribution.

Two-tailed Test

A two-tailed statistical hypothesis test that examines if a sample falls outside a specific range of values, testing for both exceeding and falling short of this range.

Expected Value

The mean value of a random variable, computed by multiplying each possible value by its probability and summing up these products.

Test Statistic

A value calculated from sample data during a hypothesis test used to determine the likelihood of the null hypothesis being true.