An analysis of GPA by class standing (FR, SO, JR, SR) and major (Social Science [SS] or Natural Science [NS]) revealed the following mean values:
Which of the following conclusions would be most likely?
$\begin{array}{|l|l|l|l|l|}
\hline & \mathrm{FR} & \mathrm{SO} & \mathrm{JR} & \mathrm{SR} \
\hline \mathrm{SS} & 2.7 & 2.8 & 3.1 & 3.2 \
\hline \mathrm{NS} & 2.6 & 2.8 & 3.0 & 3.2 \
\hline
\end{array}$
A) Significant main effect for class standing
B) Significant main effect for major
C) Significant class standing by major interaction
D) None of the above

Question

An analysis of GPA by class standing (FR, SO, JR, SR) and major (Social Science [SS] or Natural Science [NS]) revealed the following mean values:
Which of the following conclusions would be most likely?
 $\begin{array}{|l|l|l|l|l|}
\hline & \mathrm{FR} & \mathrm{SO} & \mathrm{JR} & \mathrm{SR} \
\hline \mathrm{SS} & 2.7 & 2.8 & 3.1 & 3.2 \
\hline \mathrm{NS} & 2.6 & 2.8 & 3.0 & 3.2 \
\hline
\end{array}$
A) Significant main effect for class standing
B) Significant main effect for major
C) Significant class standing by major interaction
D) None of the above

Quizplus · Accepted Answer

The data shows a pattern of increasing GPA from freshman to senior year for both Social Science and Natural Science majors, suggesting a significant main effect for class standing. There is no consistent difference between the majors across class standings, indicating no significant main effect for major or significant interaction between class standing and major.

An Analysis of GPA by Class Standing (FR, SO, JR