Please help,

1) A study of 392 healthy children living in the area of Tours, France, was designed to measure the serum levels of certain fat-soluble vitaminsnamely, vitamin A, vitamin E, beta-carotene, and cholesterol. Knowledge of the reference levels for children living in an industrial country, with normal food availability and feeding habits, would be important in establishing borderline levels for children living in other, less favorable conditions. Results are shown below a) Find a 90% CI for the difference in mean serum cholesterol levels of boys versus girls. b) Find a 95% CI for the difference in the mean beta-carotene levels of boys versus girls. c) Provide an interpretation for Parts 21 and b. d) Do the intervals in Parts a and b contain the value #1 - #2 = 0 ? Why would this be of interest to the researcher