This is ONE question. It's from part A to F. Please help me it would be really appreciated. :)

According to hospital records kept for many years, the mean weight of newborn infants is 6.6 pounds. A sample of seven infants is randomly selected and their mean weight at birth was 7.55 pounds with sample standard deviation 1.18 pounds. At the 0.05 level of significance, is the mean weight of newborn infants greater than 6.6 pounds?

a. What are the null and alternate hypotheses? A. Ho: H 2 6.6 H1: 1 6.6 C. Ho: H = 6.6 H1: 1 # 6.6 b. What test statistic and formula should be used to test the hypotheses? A. Z = (x - u)vn B. t = ( X - u)vn S p - n C. Z = n X 1 - X2 D. Z = 01 2V n n2 c. What decision rule should be used to test the hypotheses? A. Reject H o if z > 1.645 B. Reject H o if z 1.943 D. Reject H o if t