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. Assuming that the variances in the population of times spent per day accessing the Internet via a mobile device are equal, is there evidence of a difference between males and females in the mean time spent per day accessing the Internet via a mobile device? (Use a 0.05 level of significance.)

b. In addition to equal variances, what other assumption is necessary in (a)?