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.

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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.

For a Sample of Size 20 Taken from a Normally