A Random Sample of Size N Has Been Selected from a Normally

question 120

Multiple Choice

A random sample of size n has been selected from a normally distributed population whose standard deviation is s. In estimating an interval for the population mean, the t-distribution should be used instead of the z-test if:

• A)n ≥ 30 and  is known.
• B)  is unknown and estimated by s, and the population is normal.
• C)Population is normal and  is known.
• D)None of these choices are correct.

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