SOLUTION: 1. Forty-four items are randomly selected from a population of 490 items. The sample mean is 33, and the sample standard deviation is 6. Develop a 95% confidence interval for the p
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Question 1195790: 1. Forty-four items are randomly selected from a population of 490 items. The sample mean is 33, and the sample standard deviation is 6. Develop a 95% confidence interval for the population mean. (Round final answer to 2 decimal places.)
The confidence interval level between ___ and _____ Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! I use t if I don't have a sd of the population. Some use a z automatically if n >30.
95% half-interval is t(0.975,df=32)*s?sqrt(n)
=2.04*6/sqrt(44)
=1.845
the interval is (31.16, 34.84)
if you use a z-test (which I would not), it would be (31.23, 34.77)
