Please show your work and include every step in a formal hypothesis test. 11. If you take a sample of 61 American adults and find they average 7.1 hours of sleep per night with a standard deviation of 1.2 hours, test the hypothesis that American adults average less than 8.0 hours of sleep using a confidence level of 95%. 3 12. From a sample of 200 American adults, we found that only 13% approve of the job Congress is doing. Test the hypothesis that out of all American adults, more than one- tenth approve of the job Congress is doing with a confidence level of 95%