Question

d. A study was conducted of babies born to mothers who use cocaine during pregnancy. A sample of 91 babies had a mean weight of 2700 grams with a standard deviation of 645 grams (based on data from “Cognitive Outcomes of Preschool Children with Prenatal Cocaine Exposure,” by Singer et al., Journal of the American Medical Association Vol. 291m No 20.Use a 0.05 significance level to test the hypothesis that the mean weight of the babies born to mothers who use cocaine is less than 2900 grams, which is the mean weight for babies born to mothers who do not use cocaine.

e. The mean resting pulse rate for men is 72 beats per minute. A simple random sample of men who regularly work out at Mitch's Gym is obtained and their resting pulse rates (in beats per minute) are listed below. Use a 0.05 significance level to test the claim that these sample pulse rates come from a population with a mean more than 72 beats per minute. Assume the population is normal.54 59 69 84 74 64 69 70 66 80 59 71 76 63

Answer 1