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

question 97

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 \(\sigma\) is known.
• B) \(\sigma\) is unknown and estimated by s, and the population is normal.
• C) Population is normal and \(\sigma\) is known.
• D) None of these choices are correct.

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