A company is going through some tough times. Some executives have recommended closing down one of its four customer centers. The four centers have equal expenses, so management decides to assess mean customer satisfaction at each center measured on a scale of 0–10 (which higher scores representing higher satisfaction) and the center with the lowest mean score will be closed. For each center 153, 85, 104, and 72 scores respectively were available.
a) Identify the experimental unit, response variable, and factor and its levels.
b) Define parameter notation and specify the null and alternative to be tested.
c) The boxplot below summarizes the scores per center. Does it indicate that any center has a different mean score?
d) Does the boxplot indicate any concern with the equal variances assumption?

Transcribed Image Text:

Score 100 90 80 70 60 50 40 30 20 2 Boxplot of score Center 3