A Simple Random Sample of Size 51 Has Mean $\bar { x } = 70.72$

question 13

Multiple Choice

A simple random sample of size 51 has mean $\bar { x } = 70.72$ . The population distribution is approximately normal, with standard deviation $\sigma = 16.25$ . Determine the correct method of finding A 95% confidence interval for the population mean and compute it.

• A) z-method: (66.15, 75.29)
• B) Cannot compute: the population size is too small.
• C) t-method: (66.15, 75.29)
• D) z-method: (66.26, 75.18)

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