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) t = 1.328
B) t = 1.729
C) z = 1.96
D) z = 1.645
E) z = 2.58

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The Answer of 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) t = 1.328
B) t = 1.729
C) z = 1.96
D) z = 1.645
E) z = 2.58

For a Sample of Size 20 Taken from a Normally