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a) Show that if X and Y are independent random variables, then Vαr(X - Y) = Vαr(X + Y)
b) Let D1 and D2 represent two draws at random with replacement from a population, with E(D1) = 10 and SD(D1) = 2. Find a number C. so that P(|D1 - D2 | c) > 99%
use the frequency distribution table to construct a probability distribution. 12- the number of hits per name played by
dr. mack lemore an expert in consumer behavior wants to estimate the average amount of money that people spend in
A new treatment for a disease is being tested, to see whether it is better than the standard treatment. The existing treatment is defective on 50% of patients.
Students that studied for more than one hour received a c+ or above on the final. Use a .05 significance level to test the professor's claim.
Graph the binomial distribution using a histogram and describe its shape. Identify any values of the random variable x that you would consider unusual.
Perfect pitch. A recent study of perfect pitch tested students in American music conservatories. It found that 7% of 1700 non-Asian and 32% of 1000 Asian.
Problem 1: The following table shows the regression output of a multiple regression model relating the beginning salaries in dollars of employees in a given company to the following predictor variables:
A person runs one mile to his house as fast as he can. It is equally likely that he will run at an average speed of 3 miles per hour, 6 miles per hour, and 9 miles per hour.
A railway has 20 stations. A one-way trip involves travel from any one station to any different station. a) How many different kinds of one-way trip tickets must be printed if each ticket identi?es the departure station and also the destination?
What is the probability that the next customer will request extra unleaded gas and fill the tank (A union B)?
A high-school department made a change in its curriculum. One of the instructors in the department suspected that the change would result in a lowering of math skills. Set up a hypothesis test
Regression equation Credits=15.4-.07. Select the correct statement. Increase in number of hours worked per week increases the expected number of credits.
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