# 1 ~ Automatic Zoom Two groups of students are surveyed about the amount of time they use on TikTok. One group o students is a sample of 25 chemistry majors, who use Tik Tok for an average of 24.65 minutes per day with standard deviation of 13.2; the other group is a sample of 19 biology majors, who use TikTok for an average of 28.34 minutes per day with standard deviation of 11.13. (a) Write down a null and alternative hypothesis to examine whether the two groups use Tik Tok for the same length of time. (b) Construct a test statistic. (c) Test your hypothesis at all appropriate levels. 8. Consider perception of a new policy between two groups of Americans, those that live in the Northeast and those that live in the Southeast. A sample of 23 people from the Northeast is taken and the sample average is 3.55 (out of 10) with standard deviation of 1.75. A sample of 65 people from the Southeast is taken and the sample average is 3.67 (out of 10) with standard deviation of 1.33. (a) Write down an appropriate null and alternative hypothesis to see whether people from the South- cast and people from the Northeast view the policy identically. (b) Construct an appropriate test statistic. (c) Test your hypothesis at all appropriate levels.. 9. A political candidate is trying to determine whether they should stay in a race. They are only viable if they receive more than 10 percent of the vote. "They sample 753 registered voters, and 312 state they will vote for the candidate. (a) Write down an appropriate null and alternative hypothesis to assess whether the candidate is viable. (b) Construct an appropriate test statistic. (c) Test your hypothesis at all appropriate levels. O a w