Gaintentavyw4
2022-09-11
Answered

If X and Y are independent random variables with equal variances, find Cov(X+Y,X−Y).

You can still ask an expert for help

asked 2021-03-18

A population of values has a normal distribution with

Find the probability that a single randomly selected value is between 133.6 and 134.1.

Write your answers as numbers accurate to 4 decimal places.

asked 2021-02-21

We wish to estimate what percent of adult residents in a certain county are parents. Out of 600 adult residents sampled, 192 had kids. Based on this, plot a

Express your answer in the form of three inequalities. Give your answers in decimal fractions up to three places

asked 2021-08-06

You are concerned about the effects of texting on driving performance. Design a study to test the response time of drivers while texting and while driving only. How many seconds does it take for a driver to respond when a leading car hits the brakes? a. Describe the explanatory and response variables in the study. b. What are the treatments? c. What should you consider when selecting participants? d. Your research partner wants to divide participants randomly into two groups: one to drive without distraction and one to text and drive simultaneously. Is this a good idea? Why or why not? e. Identify any lurking variables that could interfere with this study. f. How can blinding be used in this study?

asked 2022-09-23

Determine the correlation coefficient of the random variables X and Y if var(X) = 4, var(Y ) = 2, and var(X + 2Y ) = 15.

asked 2022-01-19

What are the mean and standard deviation of a binomial probability distribution with n=9 and $p=\frac{11}{32}$ ?

asked 2022-01-28

What is the "law of large numbers" in insurance theory?

asked 2022-01-18

What are the mean and standard deviation of a binomial probability distribution with n=150 and $p=\frac{7}{9}$ ?