# Suppose that Y1, Y2, and Y3 are independent 2-distributed random variables with 1, 2

## Problem 5.155 Chapter 5

Mathematical Statistics with Applications | 7th Edition

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Problem 5.155

Suppose that Y1, Y2, and Y3 are independent 2-distributed random variables with 1, 2, and 3 degrees of freedom, respectively, and that W1 = Y1 + Y2 and W2 = Y1 + Y3. a In Exercise 5.87, you derived the mean and variance of W1. Find Cov(W1, W2). b Explain why you expected the answer to part (a) to be positive.

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1 STAT 145 Introduction to Statistics 1 Chapter 2 ­ Organizing and Summarizing Data Terms ​ ormulas 2.1 Organizing Qualitative Data Objectives: ​Group data in tables / Construct bar graphs and pie charts...

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