Listed below are weight(hg) of randomly selected girls at birth, based on data from the NCH Statistics research. Use the below sample data 33 28 33 37 31 32 31 28 34 28 33 26 30 31 28 a) to construct a 90% confident interval for the mean birth weight of girls. b) Construct the 92% confident interval for the mean birth weight of girls with is 3.1 hg.