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There are three doors on the stage. Behind one door is a car, behind the other two doors are goats. Monty Hall (the emcee) gets the contestant to pick one of the doors. Monty does not reveal what is behind the contestant's chosen door, but he does open one of the other doors and reveals a goat. What are your chances of winning if you stay with door #1? What are your chances of winning if you switch?
Texas oilman T. Boone Pickens says that natural-gas fracking is perfectly safe and poses no threat to the nation's drinking water.
bob nale is the owner of nales quick fill. bob would like to estimate the mean number of gallons of gasoline sold to
A small company has 20 employees. Six of these employees will be selected randomly to be interviewed as part of an employee satisfaction program.
provide an example of each of the following types of data nominal ordinal interval and
Can you please derive the mean and variance of a RV X, which has a Poisson distribution.
70 people received a higher score on the second test, 13 a lower score, and 1 received the same score. At the 0.05 significance level, test the claim that the music has no effect on memorization skills.
in one study of smokers who tried to quit smoking with nicotine patch therapy 39 were smoking one year after the
The committee randomly surveyed 81 people who recently served as jurors. The sample mean wait time was eight hours with a sample standard deviation of four hour
What are the mean and standard deviation of the average loss for 14 policies? (Round your standard deviation to two decimal places.)
An insurance salesperson sells an average of 1.4 policies per day. Using the Poisson formula, find the probability that this salesperson will sell no insurance.
A researcher computes the mean, the median, and the mode for a set of n = 50 responses to this question. Which of the following statements accurately describes the measures of central tendency?
the amount of money college students spend each semester on textbooks is normally distributed with a mean of 195 and a
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