Question: 7.89 The following data represent the scores obtained from a random sample of 20 people who attempted an IQ test having a maximum score of

7.89 The following data represent the scores obtained from a random sample of 20 people who attempted an IQ test having a maximum score of 100:

85 92 54 46 98 70 63 56 95 40 57 98 81 47 72 40 68 41 70 94

a. What is the reliability factor for a 90% confidence interval estimate of the mean IQ test score?

b. Find the LCL for a 99% confidence interval estimate of the mean IQ test score.

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