SOLUTION: A sample of 20 elements produced a mean of 81.4 and a standard deviation of 10.44.
Assuming the population has a normal distribution, construct a 90% confidence interval for
the
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Question 1159422: A sample of 20 elements produced a mean of 81.4 and a standard deviation of 10.44.
Assuming the population has a normal distribution, construct a 90% confidence interval for
the population mean.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
half-interval is t(0.95,df=19)*s/sqrt(n)
=1.729*10.44/sqrt(20)
=4.04
90% CI is (77.36, 85.44)
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