Answer Happy

Homework 28: Problem 1 Previous Problem Problem List Next Problem (1 point) A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent study. A sample of 69 women over the age of 50 used the new cream for 6 months. Of those 69 women, 57 of them reported skin improvement (as judged by a dermatologist). Is this evidence that the cream will improve the skin of more than 40% of women over the age of 50? Test using a = 0.05. (a) Test statistic: z = (b) Critical Value: z* = (c) The final conclusion is A. We can reject the null hypothesis that p = 0.4 and accept that p > 0.4. That is, the cream can improve the skin of more than 40% of women over 50. B. There is not sufficient evidence to reject the null hypothesis that p = 0.4. That is, there is not sufficient evidence to reject that the cream can improve the skin of more than 40% of women over 50.