A sample of 250 observations is selected from a normal population for which the population. standard deviation is known to be 25.
2) A sample of 250 observations is selected from a normal population for which the population. standard deviation is known to be 25. The sample mean is 20 .
a. Determine the standard error of the mean.
b. Determine the 95 %confidence interval for the population mean.
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A sample of 250 observations is selected from a normal population for which the population. standard deviation is known to be 25.
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