An article appearing in The Exponent, an independent college newspaper published by the Purdue Student Publishing Foundation, reported that the average American college student spends one hour (60 minutes) on Facebook daily. (Data extracted from bitly/NQRCJQ.) You wonder if there is a difference between males and females. You select a sample of 60 Facebook users (30 males and 30 females) at your college and collect data about the time spent on Facebook per day (in minutes ) and store these data in Facebooktime2.
a. Using a 0.05 level of significance, is there evidence of a difference in the variances of time spent on Facebook per day between males and females?
b. On the basis of the results in part (a), which t test defined in Section 10.1 should you use to compare the means of males and females? Discuss.