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- Suppose X, Y, Z are iid observations from a Poisson distribution with parameter λ, which is unknown. Consider the 3 estimators T1 = X + Y − Z, T2 = 2X + Y + Z 4 , T3 = 3X + Y + Z 5 . (a) Which among the above estimators are unbiased? (b) Among the class of unbiased estimators, which has the minimum variance?Suppose that the number of drivers who travel between a particular origin and destination during a designated time period has a Poisson distribution with parameter λ=20 (suggested in the article "Dynamic Ride Sharing: Theory and Practice," J. of Transp. Engr., 1997: 308-312). What is the probability that the number of drivers will a. Be at most 10? b. Exceed 20? c. Be between 10 and 20, inclusive? Be strictly between 10 and 20? d. Be within 2 standard deviations of the mean value?a) A random sample of 6 insurance claims is selected from a lot of 15 that has 3 non-conforming units. Using the hypergeometric distribution, what is the probability that the sample will contain exactly 3 non-conforming units? What is the probability that the sample will contain less than 2 non-conforming units? b) A process is in statistical control with a mean of 79.5 mm and a standard deviation of 1.85. Theupper specification limit is 80.2 mm, and the lower specification is 78.6 mm. What are the valuesof Cp, Cpk?
- As λ increases, say, to values greater than 30, the Poisson distribution begins to be very similar to the normal with both a mean and variance of μ. Using this approximation, determine how many 911-operators are needed to ensure at most 5% busy signals if the mean number of emergency phone calls at any given time is 40. Number of 911-operators to ensure at most 5% busy signals is: __________1.The number of customers who enter a shop in an hour is Poisson distributed with a mean of 6. Calculate the percentage of hours in which less than 2 customers enter the shop.