Nonproportional stratified the sample
In the nonproportional stratified the sample, the number of items studied in each stratum is disproportionate to their number in the popluation. We then weight the sample results according to the stratum's proportion of the total population.
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A confidence interval estimate for the population mean is given to be (35.71, 44.14). If the standard deviation is 13.045 and the sample size is 52, answer each of the following (show all work):
By measuring the amount of time it takes a component of a product to move from one workstation to the next, an engineer has estimated that the standard deviation is 4.34 seconds.
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