A Random Sample of 144 Observations Has a Mean of 20

question 13

Multiple Choice

A random sample of 144 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)19.200 to 20.800
• C)19.216 to 20.784
• D)21.2 to 22.8

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