Pearson eText for Probability and Statistical Inference -- Instant Access (Pearson+)
Pearson eText for Probability and Statistical Inference -- Instant Access (Pearson+)
10th Edition
ISBN: 9780137538461
Author: Robert Hogg, Elliot Tanis
Publisher: PEARSON+
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Chapter 4.3, Problem 8E

A fair six-sided die is rolled 30 independent times Let X be the number of ones and Y the number of twos.

(a) What is the joint pmf of X and Y?

(b) Find the conditional pmf of X, given Y = y.

(c) Compute E ( X 2 − 4 X Y + 3 Y 2 ) .

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Chapter 4 Solutions

Pearson eText for Probability and Statistical Inference -- Instant Access (Pearson+)

Ch. 4.1 - For each of the following functions, determine the...Ch. 4.1 - Roll a pair of four-sided dice, one red and one...Ch. 4.1 - Let the joint pmf of X and Y be defined by...Ch. 4.1 - Select an (even) integer randomly from the set...Ch. 4.1 - Each part of Figure 4.1-5 depicts the sample space...Ch. 4.1 - The torque required to remove bolts in a steel...Ch. 4.1 - Roll a pair of four-sided dice, one red and one...Ch. 4.1 - Each part of Figure 4.1-6 depicts the sample space...Ch. 4.1 - A particle starts at (0,0) and moves in one-unit...Ch. 4.1 - In a smoking survey among boys between the ages of...
Ch. 4.1 - A manufactured item is classified as good, a...Ch. 4.2 - Prob. 1ECh. 4.2 - Prob. 2ECh. 4.2 - Roll a fair four-sided die twice. Let X equal the...Ch. 4.2 - Let X and Y have a trinomial distribution with...Ch. 4.2 - Prob. 5ECh. 4.2 - The joint pmf of X and Y is f(x,y)=16,0x+y2, where...Ch. 4.2 - Determine the correlation coefficient p for each...Ch. 4.2 - Determine the correlation coefficient p for each...Ch. 4.2 - Let the joint pmf of X and Y be...Ch. 4.2 - A certain raw material is classified as to...Ch. 4.2 - Prob. 11ECh. 4.2 - If the correlation coefficient exists, show that...Ch. 4.3 - Let X and Y have the joint pmf...Ch. 4.3 - Let the joint pmf f(x,y) of X and Y be given by...Ch. 4.3 - Let W equal the weight of laundry soap in a...Ch. 4.3 - The gene for eye color in a certain male fruit fly...Ch. 4.3 - Let X and Y have a trinomial distribution with...Ch. 4.3 - An insurance company sells both homeowners...Ch. 4.3 - Using the joint pmf from Exercise 4.2-3, find the...Ch. 4.3 - A fair six-sided die is rolled 30 independent...Ch. 4.3 - Let X and Y have a uniform distribution on the set...Ch. 4.3 - Let fX(x)=110,x=0,1,2,...,9, and...Ch. 4.3 - Suppose that X has a geometric distribution with...Ch. 4.4 - Prob. 1ECh. 4.4 - Prob. 2ECh. 4.4 - Prob. 3ECh. 4.4 - Prob. 4ECh. 4.4 - For each of the following functions, determine the...Ch. 4.4 - Using Example 4.4-2, (a) Determine the variances...Ch. 4.4 - Let f(x,y)=43,0x1,x3y1, zero elsewhere. (a) Sketch...Ch. 4.4 - Using the background of Example 4.44, calculate...Ch. 4.4 - Two construction companies make bids of X and Y...Ch. 4.4 - Let T1 and T2 be random times for a company to...Ch. 4.4 - Let X and Y have the joint pdf f(x,y)=cx(1y),0y1,...Ch. 4.4 - Show that in the bivariate situation, E is a...Ch. 4.4 - Let x and y be random variables of the continuous...Ch. 4.4 - Let X and Y be random variables of the continuo us...Ch. 4.4 - Prob. 15ECh. 4.4 - Prob. 16ECh. 4.4 - Prob. 17ECh. 4.4 - Let f(x,y)=18,0y4,yxy+2, be the joint pdf of X and...Ch. 4.4 - Prob. 19ECh. 4.4 - Prob. 20ECh. 4.4 - Let X have the uniform distribution U(0,1), and...Ch. 4.5 - Let X and Y have a bivariate normal distribution...Ch. 4.5 - Show that the expression in the exponent of...Ch. 4.5 - Let X and Y have a bivariate normal distribution...Ch. 4.5 - Let X and Y have a bivariate normal...Ch. 4.5 - Let X denote the height in centimeters and Y the...Ch. 4.5 - For a freshman taking introductory statistics and...Ch. 4.5 - For a pair of gallinules, let X equal the weight...Ch. 4.5 - Let X and Y have a bivariate normal distribution...Ch. 4.5 - Let X and Y have a bivariate normal distribution....Ch. 4.5 - In a college health fitness program, let X denote...Ch. 4.5 - For a female freshman in a health fitness program,...Ch. 4.5 - Prob. 12ECh. 4.5 - An obstetrician does ultrasound examinations on...
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