Please someone help me.

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.