Here are the IQ test scores of 31 seventh-grade girls in aMidwest school district:4114

Chapter 0, Problem 14.6

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Here are the IQ test scores of 31 seventh-grade girls in aMidwest school district:4114 100 104 89 102 91 114 114 103 105108 130 120 132 111 128 118 119 86 72111 103 74 112 107 103 98 96 112 112 93(a) These 31 girls are an SRS of all seventh-grade girls in the school district.Suppose that the standard deviation of IQ scores in this population is known tobe = 15. We expect the distribution of IQ scores to be close to Normal. Make astemplot of the distribution of these 31 scores (split the stems) to verify that thereare no major departures from Normality. You have now checked the simpleconditions to the extent possible.(b) Estimate the mean IQ score for all seventh-grade girls in the school district,using a 99% confidence interval. Follow the four-step process as illustrated inExample 14.3.