Question

1. Why is it important to use random assignment when determining which research participants will comprise the different treatment groups in the study?

Select one:

a. Without random assignment, there is no way to conduct statistical analyses of the data that are collected.

b. Because there is no form of research that can be conducted without using random assignment.

c. Random assignment balances out the differences that might naturally exist between participants.

d. Random assignment eliminates variability from research.

2. What is sample size?

Select one:

a. the amount of a substance administered to participants in a study

b. the number of participants in a study

c. the ability of a study to detect reliable effects

d. the number of people in a specific demographic group

3. Using some probability based method of dividing a sample of research participants into different treatment groups is called ________.

Select one:

a. random sampling

b. in-group stratification

c. out-group stratification

d. random assignment

Answer 1

1. The correct answer is Option C. Random assignment balances out the differences that might naturally exist between participants.

2. The correct answer is Option B. The number of participants in a study is the sample size.

3. The correct answer is Option B. This process is called in group stratification.