For a Sample of Size 20 Taken from a Normally

question 137

Multiple Choice

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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