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) 19.20 to 20.80.
C) 19.216 to 20.784.
D) 21.2 to 22.8.

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The Answer of 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) 19.20 to 20.80.
C) 19.216 to 20.784.
D) 21.2 to 22.8.

A Random Sample of 144 Observations Has a Mean of 20