In an experiment, one female and one male restaurant server drew happy faces on the checks of randomly chosen dining parties. The figure for this exercise is a dotplot comparing tip percentages for the female (n = 22 checks) to the tip percentages for the male (n = 23 checks).
a. Compare the two servers with respect to the approximate centers (locations) of their tip percentages.
b. Compare the two servers with respect to the variation (spread) among tip percentages.
c. Explain whether you think there are any outliers in the dataset or not. If you think there are outliers, give their approximate values.