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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 0.055 of the true proportion. Assume a 99 percent level of confidence. The president's political advisors estimated the proportion supporting the current policy to be 0.74. (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?
Find the upper and lower control limits for x and r charts for the width of a chair seat when the sample grand mean (based on 30 samples of 6 observations each) is 27.0 inches, and the average range is 0.35 inches.
two points are randomly on a line of length 14 so as to be on opposite sides of the midpoint of the line. in other
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If there is a difference between the two groups of scores. Briefly explain how the difference may have been caused by the treatments.
Suppose that in a population of 10 items, 3 are defective and 7 are not. Suppose that two items are chosen at random for inspection. Let X be the number of defective items inspected. report all probabilities to a minimum of 5 decimal places of acc..
An olympic archer is able to hit the bull's-eye 70% of the time. Assume each shot is independent of the others. If she shoots 6 arrows, what is the probablitly that she never misses?
What is the probability that the income is between $1,000 and $1,800? (Be able to draw a graph to illustrate your results)
the journal of research in crime and delinquency has published a study on the situational characteristics of crimes. in
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Using a 1% level of significance, can we say that there is a difference in the average waiting time between the two shops? Find the critical value(s).
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
the first internet bank wants to encourage its customers to do all their banking online. it offers higher interest to
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