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Hurricanes, redux. We first looked at the occurrences of hurricanes in and found that they arrive with a mean of 2.45 per year. Suppose the number of hurricanes can be modeled by a Poisson distribution with this mean.
a) What's the probability of no hurricanes next year?
b) What's the probability that during the next two years, there's exactly 1 hurricane?
The dice game craps is played as follows. The player throws two dice, and if the sum is seven or eleven, then he wins. If the sum is two, three, or twelve, then he loses. If the sum is anything else, then he continues throwing until he either thro..
(a) Find the expected value (in dollars) of the amount won by one entry. (b) Find the expected value (in dollars) if the cost of entering this sweepstakes is the cost of a postage stamp (34 cents)
A doctor is asked to give an executive a thorough physical checkup to test the null hypothesis that he will be able to take on additional responsibilities.
Drunks. Police often set up sobriety checkpoints- roadblocks where drivers are asked a few brief questions to allow the officer to judge.
Why do researchers want the error variance in their data to be small?- Why do researchers use meta-analysis?
Suppose that the number of ounces of soda put into a soft-drink can is normally distributed with µ = 12.05 ounces and s = 0.03 ounce.
Shown here are the U.S. oil refineries with the largest capacity in terms of barrels per day according to the U.S. Energy Information Administration.
Estimate the proportion of all houses that have brick cladding - suggest that the proportion houses sold that don't have heating could be less than 65%?
Given the binomial distribution with n = 23 and p = 0.79, would the normal distribution provide the reasonable approximation? Why or why not?
The underlying data are in file XR10033. Identify and interpret the p-value for the test. Using the 0.025 level of significance, what conclusion will be reached?
Learning math. Developers of a new math curriculum called "Accelerated Math" compared performances of students taught by their system with control groups.
Based on your answer to part a, is it unusual for a passenger to have mishandled luggage? Is Peter Greenberg's comment and advice warranted? Explain your answers.
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