Exercise 18. Consider the following data: 89.4 77.5 98.9 93.7 67.9 91.5 49.2 61.1 70.0 62.5. a) Assuming the data are normally distributed, find a 95%-confidence interval for the mean . b) Assume that we have somehow learned that the above sample comes from a normal distri- bution with variance o2 = 172, how should we adjust the confidence interval to incorporate this extra information?

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A: n1=754, x1=37n2=746, x2=15

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Q: b) Find P(Z < 0.5)

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