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A Poisson random variable has a PMF of the form
k = 0,1,2.....
(a) Find the characteristic function
(b) Find the first three nonzero terms in the Taylor series expansion of
(c) Use the results of part (b) to find the mean, variance, and skewness of the Poisson random variable.
the mean and the standard deviation of the sample of 40 trash bag breaking strengths are 50.575 and 1.6438
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In a large population of college-educated adults, the mean IQ is 118 with a standard deviation of 20. What is the probability that a randomly selected adult from this population has an IQ that is greater than 120?
The average hourly wage last year for members of the hospital clerical staff in a large city was $6.32. The standard deviation of the population was $.54. This year a sample of 50 workers had an average hourly wage of $6.51. Test the claim at alph..
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Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
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