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A simple random sample of 100 of a certain popular model car in 2003 found that 20 had a certain minor defect in the brakes. A simple random sample of 400 of this model car in 2004 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of this model in 2003 and 2004, respectively, that actually have the defect. What is a 90% confidence interval for p1 - p2?
To model this fact, we assume that only half of the goods produced during a week can be used to meet the current week's demand (assume that all of the prior week's ending inventory can be used to meet the current week's demand). Determine how to m..
Suppose it has been determined that the average number of customers waiting for service is 1.929. There are two servers. Determine:
Compute the probability that student eats at fast food restaurant 2 or more times per week?
Assuming the nurses surveyed were a simple random sample from the population of all nurses in the United States, find the appropriate null hypothesis for these data
30% of households say they would feel secure if they had $50,000 in savings. you randomly select 8 households and ask them if they would feel secure if they had $50,000 in savings. find the probability that the number that say they would feel secu..
To help schedule staffing and equipment needs, a large hospital uses a multiple regression model to predict its 'bed census' y, the number of beds occupied at the end of each day.
A factory finds,on average, 20% of the widgets produced by a given machine will be defective for certain specified requirements.
Explain in your own words how to recognize a situation where you needed to use a two-sample test. Give a unique example of a two sample test for proportion or mean. Make sure to detail why only a two sample test would suffice.
You're considering paying $5 to buy a ticket in a local lottery. You were told that 10,000 tickets will be sold. There are 5 prizes. The first prize is $5,000, the second is $1,000, the third is $500, the fourth is $100 and the last prize is $10.
If 20 measurements are taken and their standard deviation is 1.8, is there enough evidence to reject the claim that her standard deviation is within the limit at ∞ = .01?
You decide to predict gasoline prices in different cities and towns in the U.S. for your term project. Your dependent variable is price of gasoline per gallon and your explanatory variables are per capita income
To investigate he selects a sample of eight weeks and determines the number of new cars sold and the number of sales people on duty for that week. a) What are the dependent and independent variables?
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