Percent confidence interval for the population mean weight
A sample of 16 items yields Xbar = 50 grams and s = 3.2 grams. Assuming a normal parent distribution, construct a 90 percent confidence interval for the population mean weight.
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A machine produces components for use in cellular phones. At any given time, the machine may be in one, and only one, of three states: operational, out of control, or down. From experience with this machine, a quality control engineer knows that t
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A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is ?=15. Compute the 95% confidence interval for the population mean.
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