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A city planner wants to estimate, with a 95% confidence level, the average monthly residential water usage in the city. Based on earlier data, the population standard deviation of the monthly residential water usage in this city is 387.80 gallons. How large a sample should be selected so that the estimate for the average monthly residential water usage in this city is within 95 gallons of the population mean?
Round your answers to the nearest integer.
n=
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If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
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Find the lowest possible score a candidate can score and still qualify. Assume the scores are normally distributed.
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Prostate cancer are actually proven correct through subsequent biopsy. JBGHI demands a sample large enough to ensure an error of ± 2% with 90% confidence. What is the necessary sample size?
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Construct an appropriate control chart and comment on the performance of the billing department. Revise the control limits, if necessary, assuming special causes for out-of-control points.
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