Are university faculty members in Science, Technology, Engineering, and Math (STEM) disciplines more satisfied with their job than non-STEM faculty? And if so, does this difference vary depending on gender? These were some of the questions of interest in a study published in the Journal of Women and Minorities in Science and Engineering (Vol. 18, 2012). A sample of 215 faculty members at a large public university participated in a survey. One question asked the degree to which the faculty member was satisfied with university policies and procedures. Responses were recorded on a 5-point numerical scale, with 1 = strongly disagree to 5 = strongly agree. Each participant was categorized according to gender (male or female) and discipline (STEM or non STEM). Thus, a 2 × 2 factorial design was utilized.
a. Identify the treatments for this experiment.
b. For this study, what does it mean to say that discipline and gender interact?
c. A plot of the treatment means is shown below. Based on this graph only, would you say that discipline and gender interact?
d. Construct a partial ANOVA table for this study. (Give the sources of variation and degrees of freedom.)
e. The journal article reported the F-test for interaction as F = 4.10 with p-value = .04. Interpret these results.

3.30 Stem 3.20 3.10 3.00 Non-Stem 2.90 Men Women Estimated Margin al Means