Here is a regression using GSS2008 data. The independent variables are two reference group variables, one for blacks and one for others (those not white and not black). Therefore, whites are the reference group. The dependent variable is the number of times the respondent has been to a zoo in the past year.
ZOOVISITS = 1.05 - .32 (BLACK) + .59 (OTHER)
The exact significance of the slope for the BLACK variable was .081, while the exact significance of the OTHER variable was .008. From this information, what is the best conclusion?
A) With regard to zoo visits, the population of whites and the population of others differ.
B) With regard to zoo visits, the population of whites and the population of others differ; and in addition, the population of whites and the population of blacks differ.
C) With regard to zoo visits, the population of whites and the population of others differ; and in addition, the population of blacks and the population of others differ.
D) With regard to zoo visits, the population of blacks and the population of others differ.

Question

Quizplus · Accepted Answer

All we can say with these results is based on the only statistical significant slope: others differ from whites. Others and blacks may indeed differ, but this regression equation cannot tell us this, since the all of the slopes are in reference to whites.

Here Is a Regression Using GSS2008 Data