how do you make the quartile within 95% using set 3 as an example

The following data sets represent simple random samples from a population (a) Compute the sample mean of each data set. whose moan is 100. Complete parts (a) through (c) below. Calculate the sample mean for data set I. Full data set Data Set I x = 99.875 106 120 128 91 74 77 109 (Type an integer or a decimal.) Data Set I 106 120 94 128 74 109 Calculate the sample mean for data set li. 86 112 89 111 117 124 102 81 100 X = 99.6 Data Set II (Type an integer or a decimal.) 106 120 128 91 74 17 109 Calculate the sample mean for data set ill. 112 111 117 99 124 102 86 81 100 89 108 115 91 x = 90.4 102 104 94 116 (Round to three decimal places as needed.) (b) For each data set, construct a 95% confidence interval about the p mean. Construct a 95% confidence interval for data set I. The lower bound is 83.69 The upper bound is 116.06 (Round to two decimal places as needed.) Construct a 95% confidence interval for data set II. The lower bound is 92.14. The upper bound is 107.06. (Round to two decimal places as needed.) Construct a 95%% confidence interval for data set Ill. The lower bound is The upper bound is (Round to two decimal places as needed.)