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Suppose the U.S. president wants an estimate of the proportion of the population who support his current policy toward revisions in the Social Security system. The president wants the estimate to be within 0.05 of the true proportion. Assume a 90 percent level of confidence. The president's political advisors estimated the proportion supporting the current policy to be 0.65. (Round up your answers to the next whole number.)
(a) How large of a sample is required? .
(b) How large of a sample would be necessary if no estimate were available for the proportion that support current policy?
The sample mean of the number of spots on the 6000 rolls, should be about If this die is rolled 6000 times, the number of times we get a 2 or a 3 should be about
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A study of 20 worldwide financial institutions showed the correlation between their assets and pretax profit to be .86. At the .05 significance level
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What proportion of time will it take clean-up crew 56 or more hours for cleaning plant? Define the lower and upper limits of interval.
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