In problem 3.1 at the end of Chapter 3, you calculated measures of central tendency for six variables for freshman and seniors. Three of those variables are reproduced here. Calculate the mean (if necessary), the range, and the standard deviation for each variable. What information is added by the measures of dispersion? Write a paragraph summarizing the differences between freshmen and seniors.

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Out-of-Pocket Expenses Number of Movies Rating of Cafeteria Food Seniors Seniors Freshmern Seniors 10 14 10 45 47 仪) 30 14 52 径, 51 43 10 40 49 45 14 0