A Random Sample of 64 Observations Has a Mean of 20

question 6

Multiple Choice

A random sample of 64 observations has a mean of 20, a median of 21, and a mode of 22. The population standard deviation is known to equal 4.8. The 95.44% confidence interval for the population mean is

• A) 15.2 to 24.8.
• B) 18.8 to 21.2.
• C) 18.986 to 21.014.
• D) 21.2 to 22.8.

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