A study of violence in prison cell blocks was concerned about the amount of space available to each inmate and the proportion of inmates identified as gang members who had been identified as gang members. The researcher tested the hypothesis of an interaction effect between space available and the proportion of inmates identified as gang members. A regression analysis produced the following results:

a. What is the effect of space available at the mean proportion of gang members for the sample of cell blocks? Interpret this effect.

b. What is the effect of proportion of gang members at the mean level of space available for the sample of cell blocks? Interpret this effect.

c. What is the effect of space available at each of the following proportions of gang membership?

0.2

0.4

0.6

0.8

Describe how the effect of space available changes as proportion of gang membership increases.

d. What is the effect of proportion of gang membership at each of the following values of space available?

3

6

12

15

Describe how the effect of proportion of gang membership changes as the level of space available increases.