Answer: Number of friends on Facebook. Facebook recently

Chapter , Problem 15.30

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Number of friends on Facebook. Facebook recently examined all active Facebook users (more than 10% of the global population) and determined that the average user has 190 friends. This distribution takes only integer values, so it is certainly not Normal. It is also highly skewed to the right, with a median of 100 friends.10 Consider the following SRS of n 30 Facebook users from your large university. FACEFR 594 60 417 120 132 176 516 319 734 8 31 325 52 63 537 27 368 11 12 190 85 165 288 65 57 81 257 24 297 148 (a) Use the Wilcoxon signed rank procedure to test the null hypothesis that the median number of Facebook friends for Facebook users at your university is 190. Describe the steps in the procedure and summarize the results. (b) Exercise 7.26 (page 442) asked you to analyze these data using the t procedure. Perform this analysis and compare the results with those that you found in part (a).