gun-\"=13: IIII lg Experian Marketing Services re orted that the typical American spends a mean of 144 minutes 52.4 hours) per day accessing the Internet via a mobile device. (Source: The 2o14 Digital Marketer, available at ex.pn/1kXijX.) In order to test the validity of this statement, you select a sample of 3o friends and family. The results for the time spent per day accessing the Internet via mobile device (in minutes) are stored in InternetMobileTime . a. Is there evidence that the population mean time spent per day accessing the Internet via mobile device is different from 144 minutes? Use the p-value approach and a level of significance of o.o5. b. What assumption about the population distribution is needed in order to conduct the t test in (a)