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Replacement times for Maytag washer and dryer sets are normally distributed with a mean of 8.8 years and a standard deviation of 1.5 years.
(a) Find the replacement time (in years) that separates the top 15%% from the bottom 85%%.
(b) If the manufacturer wants to provide a warranty time so that only 1%% of the washer and dryer sets will be replaced before the warranty expires, what length of time (in years) would you recommend for the warranty?
What is the critical value at a=0.05? What is the value of the between-group variance? Round your answer to two decimal places.
In Meijer supermarket, the customer's waiting time to check out is approximately normally distributed with a standard deviation of 2.5 minutes.
An independent sample t-test for gender (IV) and pretest scores (DV) Were there significant gender differences? How do you know? Interpret the results statistically and in words.
In a certain county, 40% of registered voters are Democrats, 32% are Republicans, and 28% are Independents. Sixty percent of the Democrats, 80% of the Republicans, and 30% of the Independents favor increased spending to combat terrorism. If a..
You have the choice of investing a sum of money in four alternative schemes: one which will pay 10 per cent per annum interest compounded daily.
Assuming a two-tailed hypothesis test with a = .05, what is the chance of making a Type I error?
Write the equation of a quadratic model for y as a function of x1.- Identify the β term in the model that allows for a curvilinear relationship between y and x1.
The model was fit to the data using SAS. Find the least squares prediction equation on the printout shown below.- Interpret the estimated β coefficients in your model.
We consider a queueing system in which ordinary customers arrive according to a Poisson process with rate λ and are served in a random time having an exponential distribution, with parameter μ, by either of two servers.
suppose a birth control pill is 97 effective in preventing pregnancy.a what is the probability that none of 100 women
Is there any evidence to suggest that the mean floor area of very large buildings is greater than 9 million square feet?
According to a recent poll by the Pew Internet Project, girls between the ages of 14 and 17 send an average of 187 text messages each day.
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