LIND 18E STATISTICAL TECHNIQUES IN BUSIN
LIND 18E STATISTICAL TECHNIQUES IN BUSIN
18th Edition
ISBN: 9781264307746
Author: Lind
Publisher: McGraw Hil
Question
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Chapter 1, Problem 8CE

(a)

To determine

To explain: Whether the information on the average grade of students for course 201 is collected using a sample or a population.

(b)

To determine

To explain: Whether the average profit as a percentage of revenue for the first ranked corporation in the Fortune 500 for each in the last 10 years is collected using the sample or population.

(c)

To determine

To explain: Whether the information of five pharmaceutical companies’ mission, profitability, products, and markets information is collected using the sample or population.

(d)

To determine

To explain: If the estimate of the amount of memory for a digital music player should be done using a sample or population.

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28. (a) Under what conditions do we say that two random variables X and Y are independent? (b) Demonstrate that if X and Y are independent, then it follows that E(XY) = E(X)E(Y); (e) Show by a counter example that the converse of (ii) is not necessarily true.
1. Let X and Y be random variables and suppose that A = F. Prove that Z XI(A)+YI(A) is a random variable.
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