Question: 39. For a 90% confidence interval the corresponding value to use for the z-score is. A. z = 1.96 B. z= 1.69 C. z= 2.33

39. For a 90% confidence interval the corresponding value to use for the z-score is. A. z = 1.96 B. z= 1.69 C. z= 2.33 D. z = 1.645 40. For a sample of size 50 whose mean is 10 and which has a population standard deviation of 4. A 99% confidence interval would be given by the formula: A. 10#1.96 4 4 C. 1012.33 4 V50 B. 1012.575 150 V50 D. 10#1.645 4 V50

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