A Sample of Size N=15 Is Drawn from an Approximately

question 38

Multiple Choice

A sample of size n=15 is drawn from an approximately normal population whose standard deviation is $\sigma = 5.5$ The sample mean is $\bar { x } = 40.8$ Construct a 90 % confidence interval for $\mu .$

• A) (30.28,51.32)
• B) (40.80,43.14)
• C) (39.80,41.80)
• D) 38.46,43.14

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