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The Federal Trade Commission provided measured tar contents (in mg) of randomly selected filtered and nonfiltered king-size cigarettes. A random sample of 21 filtered king-size cigarettes has a mean tar content of 13.3 mg with standard deviation 3.7 mg. A random sample of 8 nonfiltered king-size cigarettes has a mean tar content of 24.0 mg with standard deviation 1.7 mg. Assuming unequal variances between the two populations of cigarettes, you need to test the claim that the mean amount of tar in filtered king-size cigarettes is less than the mean amount of tar in nonfiltered king-size cigarettes at a 0.05 significance level. What type of statistical test should I use and what should I use for the value of the test statistic?
A screening test is used in the same way in two similar populations, but the proportion of false-positive results among those who test positive in population A is lower than that among those who test positive in population B.
Revise the prior probabilities in light of the consultants track record - What is the posterior probability of good demand given that the consultant has indicated demand will be good?
The finance department of an automobile insurance company uses a multiple regression model to estimate the total number of accident claims that will be filed each month.
AP Stats. The College Board reported that 60% of all students who took the 2006 AP Statistics exam earned scores of 3 or higher.
Suppose that the student just found out that she passed the CPA examination. What is the probability that she will be offered a job?
Four unsuspecting drivers take their autos to the station for inspection on four different days and randomly select one of the two teams. If all four cars are new and in excellent condition, what is the probability that three of the four will be re..
What is the probability that a professional (selected at random) would accept the promotion? Reject it? What is the probability that a professional (selected at random) is part of a twocareer marriage? A one-career marriage?
Use the Ney man-Pearson lemma to indicate how to construct the most powerful critical region of size α to test the null hypothesis θ = θ0, where θ is the parameter of a binomial distribution with a given value of n, against the alternative hypoth..
question a researcher is interested in comparing the effectiveness of three different kinds of therapy for anger
A poll of U.S. health professionals revealed 82% would choose the same career. In a hypothesis test conducted at a level of significance of 5%, a P-value of 0.023 was obtained.
A local coffee shop places a game piece on its coffee cups. The probability of winning a prive in a game is 1 in 4.
Based on a study of IQs of men and women who play chess competitively, a researcher concludes that playing chess causes people to become smarter. Do you agree with this conclusion?
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