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In a recent survey, 61% of the community favored building a police substation in their neighborhood. If 14 citizens of the neighborhood are chosen. A. Find the probability that exactly 12 of them favor building the police substation.
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
What are the five steps for calculating probabilities of events? Please apply these steps to an example.
If the store orders three copies of the magazine, what is the mean value of the profit? (Profit = Revenue - Cost). If the store orders four copies of the magazine, is it better to order four than three copies of the magazine. Explain.
Find the expected value if the cost of entering this sweepstakes is the cost of a postage stamp. Is it worth entering the contest?
For the sample of men, performance on the simulator task declined by an average of 2.9 points with s = 4.1. Is this a statistically significant change? Use a two-tailed test with = .05.
Given that Americans of Mexican ancestry constitute 79.1 % of the populations of those eligible for jury duty and given that Partida was convicted by a jury of 12 people with only 58% (7 jurors) of them that were Americans of Mexican ancestry, can..
Let p1 = 100 and n1 = 500; and p2 = 200 with n2 = 500. Test whether there is a statistical difference between the two proportions at the 5% significance level.
For two samples from what are assumed to be normally distributed populations, the sample size and standard deviations are n1 = 10, s1 = 23.5, n2 =9 and s2=10.4.
Finding appropriate z- and t-scores is important when constructing confidence intervals. Confidence intervals allow one to estimate important population parameters such as population mean, population proportion, population standard deviation, etc.
Consider the linear system x' = Ax, where A is a n x n real matrix. If x = x(t) is a solution of the linear system, we define:
Large university health system, 55 of 120 randomly selected physicians were women. Find the critical values to two decimal places if alpha=0.05.
Determine the probability that no female are hired. Determine the mean and standard deviation of X.
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