SOLUTION: A sample of 81 observations is taken from a normal population with a standard deviation of 5.the sample mean is 40.determine the 95%condiedence interval for the population mean.
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-> SOLUTION: A sample of 81 observations is taken from a normal population with a standard deviation of 5.the sample mean is 40.determine the 95%condiedence interval for the population mean.
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Question 1196486: A sample of 81 observations is taken from a normal population with a standard deviation of 5.the sample mean is 40.determine the 95%condiedence interval for the population mean. Answer by ewatrrr(24785) (Show Source):
Hi
***Need to Know
ME =
µ - ME < µ < µ + ME
&
Round the confidence interval limits to the same number of decimal places
as the sample standard deviation
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determine the 95% coniidence interval for the population mean.
n = 81
= 40
=5
z (95% confidence interval, df = 80) is 1.96
ME = = 1 (rounded to nearest whole number)
40 - 1 < < 40 + 1
CI: ( 39, 41)
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