more time on the internet: a research polls a sample of adults in the year , asking them how many hours per week they spent on the internet. the sample mean was with a standard deviation of . a second sample of adults was taken in the year . for this sample, the mean was with a standard deviation of . assume these are simple random samples from populations of adults. can you conclude that the mean number of hours per week spent on the internet increased between and ? let denote the mean number of hours spent on the internet in and denote the mean number of hours spent on the internet in . use the level and the -value method with the table.