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Please solve the problems


(From Excel) social networks 45 70 77 5 35 32 25

20 40 15 40 5 20 27 5 90 45 70 130 30 25 40 120 15 10 45 25 20 50 1 1 23 65 30 65 80 20 60 5 10 25 25 10 40 15 40 20 15



1.    Students at a large midwestern university were asked about the time they spend on social media sites. The time, in minutes, is given in the data table in Excel for your convenience.


a.    Copy the data into Statcrunch to generate the box plot for the social media data, and paste your answer here.  Choose a horizontal display, and comment on the data. (6 pts)






b.    Calculate in Excel the mean and standard deviation for the social media sample data. (4 pts)




c.     Use the data from (b) to calculate the following confidence intervals for the mean in statcrunch, and paste the output here. Use the command sequence "Stats/Zstats/one sample/with summary" (4 pts each)

                                              i.    80%


                                             ii.    90%



                                            iii.    92%


                                            iv.    95%


2.    Radiation measurements on a sample of 65 microwave ovens produces a sample mean of 0.11 and a sample standard deviation of 0.06. Determine a 95% confidence interval for the mean.

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