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Screen Shot 2019-08-01 at 10.47.26 AM.pngI need answer for number 39

and 40.

Screen Shot 2019-08-01 at 10.47.26 AM.png

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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