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Estimates published by the World Health Organization state that one out of every three workers may be toiling away in workplaces that make them sick. If seven workers are selected at random, what is the probability that a majority of them are made sick by their workplace?
Poll Confidence level. It is common for public opinion polls to have a "confidence level" of 95%, meaning that there is a 0.95 probability that the poll results are accurate within the claimed margins of error.
A contractor is considering a sale that promises a profit of $32,000 with a probability of 0.7 or a loss (due to bad weather, strikes, and such) of $9000 with a probability of 0.3. What is the expected profit?
1 based on historical data your manager believes that 33 of the companys orders come from first-time customers. a
1. Assume that the interest rate in New Zealand is 9 percent. A U.S. firm plans to borrow New Zealand dollars, convert them to U.S. dollars, and repay the loan in 1 year.
Conduct a hypothesis test to determine whether the whisper number justifies a conclusion of a statistically significant increase in the consensus estimate of economists. Use a = .01 as the level of significance.
Should mean disposable income be used to predict sales based on the sample of 14 Sunflower stores? Are there any other factors not mentioned by the leasing agents that might be relevant to the store leasing decision?
Let x be amount of May rainfall in local area, and suppose that x is uniformly distributed over interval three to six inches. Write down the formula for probability curve of x.
Using analytical methods, find the PDF of Z as well as the mean-squared value, E [Z2] .- Using MATLAB, create a histogram for the probability densities for the random variable Z .
What value of the sample proportion, p Hat, is required to reject the null hypothesis, given the following sample sizes?
question the mean life of a battery used in a digital clock is 305 days. the lives of the batteries follow the normal
d. Specify the null and alternative hypotheses you would use to test whether the data provide sufficient evidence to indicate that x contributes information for the (linear) prediction of y.
Let X and Y be discrete random variables with joint PMF PX,Y (x, y) that is zero except when x and y are integers. Let W = X + Y and show that the PMF of W satisfies
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