1. a researcher believes that university students weigh more than the population. the researcher reasons that more time spent on studying for exams means having less time to exercise. the researcher selects an alpha level of 0.10 (or cl = 90%). upon looking at census data, the average american weighs 170lbs with a standard deviation of 35lbs. the researcher takes a random sample of 225 csu students and finds that the mean weight of csu students is 180lbs with a sample standard deviation of 45. is there enough evidence to reject the null hypothesis?