Showing 241 to 250 of 426 Questions
  • Refer to the Southern Economic Journal (Apr. 2008) rankings of Ph.D. programs in economics at 129 colleges and universities, Exercise. Recall that the number of publications published by faculty teaching in the Ph.D. program and the quality of the publications were used to calculate an overall productivity score for each program. The mean

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  • Refer to The Sport Journal (Winter 2007) article on a new method for ranking the driving performance of PGA golfers, presented in Exercise. In exercise Recall that the method incorporates a golfer's average driving distance (yards) and driving accuracy (percentage of drives that land in the fairway) into a driving performance index. Data

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  • Refer to the Teaching Psychology (May 1998) study of how external clues influence performance, presented in Exercise. Recall that two different forms of a midterm psychology examination were given, one printed on blue paper and the other on red paper. Grading only the difficult questions, the researchers found that scores on the blue exam

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  • Refer to the U.S. Army Corps of Engineers data on contaminated fish in the Tennessee River, presented in Example. Recall that one of the variables measured for each captured fish is weight (in grams). The weights in the data set (saved in the DDT file) can be shown to be approximately normally distributed with a mean of 1,050 grams and a

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  • Referring to Exercise 3.38, find(a) The marginal distribution of X;(b) The marginal distribution of Y.

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  • Referring to Exercise 3.39 find(a) f(y\2) for all values of y;(b) P(Y = 0 | X = 2).

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    165
  • Referring to Exercise 6.1.30, find the variance for the number of boxes of Wheaties bought before getting half of the players’ pictures and the variance for the number of additional boxes needed to get the second half of the players’ pictures.

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  • Repeat Exercise 6.39 with n = 200 and p = .5. In exercise Suppose that x has a binomial distribution with n = 200 and p = .4. a. Show that the normal approximation to the binomial can appropriately be used to calculate probabilities about x. b. Make continuity corrections for each of the following, and then use the normal approximation

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  • Repeat Exercise 6.48 with λ= 3 In Exercise 6.48 Suppose that the random variable x has an exponential distribution with 2. a. Write the formula for the exponential probability curve of x. What are the possible values of x? b. Sketch the probability curve. c. Find P (x ≤ 1). d. Find P (. 25≤ x ≤1). e. Find P (x≥ 2). f. Calcu

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  • Researchers at the University of California-Berkeley have designed, built, and tested a switched-capacitor circuit for generating random signals (International Journal of Circuit Theory and Applications, May-June 1990). The circuit's trajectory was shown to be uniformly distributed on the interval (0, 1). a. Give the mean and variance of

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