We Are Social and Hootsuite reported that the typical American spends 2.02 hours (121 minutes) per day accessing the Internet through a mobile device.

Source: Digital in 2017 Global Overview, available at bit.ly/2jXeS3F.

You wonder if males and females spend differing amounts of time per day accessing the Internet through a mobile device. You select a sample of 60 friends and family (30 males and 30 females), collect times spent per day accessing the Internet through a mobile device (in minutes), and store the data collected in InternetMobileTime2.

a. Using a 0.05 level of significance, is there evidence of a difference in the variances of time spent per day accessing the Internet via mobile device between males and females?

b. On the basis of the results in (a), which t test that Section 10.1 defines should you use to compare the means of males and females? Discuss.