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Students in a class take a quiz with eight questions. The number x of questions answered correctly can be approximated by the following probability distribution. Complete parts? (a) through? (e).
x 0 1 2 3 4 5 6 7 8
?P(x) 0.02 0.02 0.06 0.05 0.11 0.22 0.28 0.16 0.08
?(a) Use the probability distribution to find the mean of the probability distribution. μ= ?(Round to the nearest tenth as? needed.)
?(b) Use the probability distribution to find the variance of the probability distribution. Sigma squared σ2=
Of the 880 respondents, 171 admitted that at least one light had been red. Follow the four-step process to construct a 95% confidence interval.
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What is the estimate of the proporation of employees who do not use the ATM in a month? Develop a 95 percent confidence interval for the mean number of transactions per month.
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Use of herbal medicines. The American Association of Nurse Anesthetists Journal (February 2000) published the results of a study on the use of herbal medicines.
The endurance data set contains data from a 1983 paper [KM83] testing the effects of vitamin C on grip strength and muscular endurance.
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