SOLUTION: 1. 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

Question 1207887: 1. 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 Boreal(15235) (Show Source): You can put this solution on YOUR website!
this is 1.645 or d. We know the population sd, so we aren't estimating it from the sample. This uses a z-test and for 90% 1.645 is the value.
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