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Facebook provides a variety of statistics on their website that detail the growth and popularity of the site. A colleague of mine at Purdue University selected a SRS of 30 Facebook users and recorded the number of friends for each one. The 30 values are stored in the file FacebookFriends.csv.
(a) Open this data set and obtain the mean and the standard deviation of the number of friends in the sample. Summarize these data.
(b) Use the data from part (a) to compute a 95% confidence interval for µ, the average number of friends for Facebook users at Purdue. Provide a (sloppy) interpretation of your interval.
Data Set, FacebookFriends.csv :
"Friends"
99
148
158
126
118
112
103
111
154
85
120
127
137
74
104
106
72
119
160
83
110
97
193
96
152
105
171
128
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