In a regression equation that uses sex (Male=0, Female=1), years of education, and the interaction effect between sex and education, the resulting graphs are two parallel lines. Which of the following must be true?
A) The slope for sex is not statistically significant.
B) The slope for education is not statistically significant.
C) The slope for the interaction effect is not statistically significant.
D) None of the three slopes is statistically significant.

Question

Quizplus · Accepted Answer

Since the resulting graphs are parallel lines, it indicates that there is no interaction between sex and years of education. Therefore, the slope for the interaction effect is not statistically significant. However, the slopes for sex and education may still be statistically significant, and it is not necessary for all three slopes to be insignificant.

In a Regression Equation That Uses Sex (Male=0, Female=1), Years