14.13 Time on Facebook Do freshmen spent significantly more time on Facebook than other class ranks? A recent study (R. Junco, Journal of Applied Developmental Psychology, 2015, vol. 36, p. 18–29) investigated the amount of time per day freshman, sophomores, juniors, and seniors spent on Facebook while doing schoolwork.

The students surveyed were U.S. residents from a 4-year, public, primarily residential institution in the Northeastern United States. The data from the survey are available on the book’s website, with time measured in minutes. The following computer output shows the mean time each cohort spent on Facebook and an ANOVA table. Construct a 95%

confidence interval to compare the population mean time spent per day on Facebook between freshmen and seniors.

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Summary statistics for time spent on Facebook by class year and ANOVA table FR SO JU SE n 440 347 403 407 Mean 63.7 56.5 70.4 49.0 S 71.5 67.7 79.0 63.7 Source DF SS MS F P Class 3 102903 34301 6.84 0.000 Error 1593 7988051 5014 Total 1596 8090954