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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
If you were in the business of supplying heating oil in the northeastern United States, would it be useful to know if a big winter snowstorm with subzero temperatures was likely to hit Massachusetts the following month? If you were a fi refighter ..
The Sorry State Lottery requires you to select five different numbers from 0 through 59. (Order is not important.) You are a Big Winner if the five numbers you select agree with those in the drawing, and you are a Small-Fry Winner if four of your ..
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.
Use a Normal approximation to find the probability that 75% or more of the women in the sample have been on a diet.
An elevator has a uniform distribution ranging from 0 to 4 minutes. Find the mean and standard deviation of x, the time a customer on the second floor waits for an elevator.
question a researcher wants to conduct a beforeafter study on 15 subjects to determine if a treatment results in any
Joe dealt 20 cards from a standard 52-card deck, and the number of red cards exceeded the number of black cards by 8. He reshuffled the cards and dealt 30 cards. This time, the number of red cards exceeded the number of black cards by 10. Dete..
What is the probability that None of the states selected have any coastline, Exactly one of the selected states has a coastline and At least one of the selected states has a coastline?
suppose that 65 of all those who enroll at the university of iowa finish in 6 years. what is the probability that 5
find the 98 confidence interval for the difference between two means based on this information about two samples.
Problem: Do heavier people burn more energy? We have data on the lean body mass and resting metabolic rate for 12 women who are subjects in a study of dieting. Lean body mass, given in kilograms, is a person's weight leaving out all fat. Metabolic..
1. A simple random sample of 100 batteries is selected from a process which produces the batteries with a mean life of 40 months and a standard deviation of 2 months. Thus, the standard error equals .2 when n=100. If a sample size of n=1600 had be..
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