1.To try to make experimental groups as equivalent as possible before beginning any manipulations, one should use:

Group of answer choices

random selection

internal validity

random assignment

placebo group

2.The most appropriate graph type for a paired samples t-test is:

Group of answer choices

scatterplot

box plot

histogram

bar graph

3.The most appropriate graph type for an independent samples t-test is:

Group of answer choices

scatterplot

box plot

histogram

bar graph

4.When entering data into SPSS for anindependent samples t-test, the independent variable will be entered:

Group of answer choices

a. into two columns - one per group

b. into a single column with values assigned to the two groups (e.g.,0=control;1 = experimental)

c. the number of columns depends on the sample size

d. cannot determine from the information provided