Instructions: For each data set: (a) State the hypotheses. (b) Use Excel’s Tools > Data Analysis (or MegaStat or MINITAB) to perform the one-factor ANOVA, using ? = .05. (c) State your conclusion about the population means. Was the decision close? (d) Interpret the p-value carefully. (e) Include a plot of the data for each group if you are using MegaStat, and confidence intervals for the group means if you are sing MINITAB. What do the plots show?
11.3 Semester GPAs are compared for seven randomly chosen students in each class level at Oxnard University. Does the data prove a significant difference in mean GPAs? GPA1?