Standard hotel rooms in the philadelphia
A random sample of 55 standard hotel rooms in the Philadelphia, PA area has a mean nightly cost of $154.17 and a standard deviation of $38.60. Construct a 99% confidence interval for the population mean. Interpret the results.
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A copy machine dealer has data on the number x of copy machines at each of 89 customer locations and the number y of service calls in a month at each location. Summary calculations give x? = 804, sx = 2.1, ? = 14.2, sy = 3.8, and r = 0.86 What is
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