( 1 point; Here are the IQ test scores of 31 seventh – grade girls in a Midwest school district .

1 14 100 104 89 102 91 1 1 4 1 1 4 1 03 105

108 130 120 132 1 1 1 1 28 1 18 1 19 86 72

1 1 1 103 74 1 12 1 07 103 98 96 1 12 1 12 93

These 31 girls are an SAIS Of all seventh-grade girls in the school district . Suppose that the standard deviation of IQ scores in this

population is known to be ` = 15 . We expect the distribution of IQ scores to be close to Normal . Estimate the mean IQ score for all

seventh – grade girls in the school district , using a 98%’6 confidence interval .

9.9. 70027 101

to

99. 70027 101Statistics and Probability