A Simple Random Sample of Size 41 Has Mean $\bar { x } = 70.55$

question 42

Multiple Choice

A simple random sample of size 41 has mean $\bar { x } = 70.55$ and standard deviation s = 15.73. The population distribution is unknown. Determine the correct method of finding a 90% confidence Interval for the population mean and compute it.

• A) t-method: (66.41, 74.69)
• B) z-method: (66.41, 74.69)
• C) z-method: (66.51, 74.59)
• D) Cannot compute: the population size is too small.

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