Confidence interval for the population mean cost
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 cost.
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In the absence of premilinary data, how large a sample must be taken so as to be sure that a 98% confidence interval will specify the proportion to within ±0.05.
A helicopter propeller blade starts from rest and experiences a constant angular acceleration of 14.5 rad/s2. Find the speed of a point on the blade 2.15 m from the axis of rotation when the blade has completed 16 revolutions.
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In January 1971, a Gallup Poll asked, "A proposal has been made in Congress to require the US government to bring home all US troops before the end of the year. Would you like to have your congressman vote for or against this proposal?" Guess the
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Cortisone is a natural steroid that can be isolated from the adrenal cortex. It has anti-inflammatory properties and is used totreat a variety of disorders.
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