SOLUTION: For a sample of size 20 taken from a normally distributed population with standard deviation equal to 5, a 90% confidence interval for the population mean would require the use of:

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Question 1207862: For a sample of size 20 taken from a normally distributed population with standard deviation equal to 5, a 90% confidence interval for the population mean would require the use of:
a. z = 2.58
b. t = 1.328
c. z = 1.96
d. z = 1.645
e. t = 1.729
Answer by amarjeeth123(570) About Me  (Show Source):
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For a sample of size 20 taken from a normally distributed distribution.
Therefore, the correct answer is 4. z = 1.645. This is the z-score for a 90% confidence interval.
Correct answer=(d)z = 1.645