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Five years ago, an automobile manufacturer started offering an extended warranty to buyers of its sport-utility vehicle. The extended warranty covered defects occurring after the initial three-year warranty expired. Of the 10,000 people who bought the sport-utility vehicle in the first year of the program, 15% purchased the extended warranty. In the Warranty Department, you have recently received data on a random sample of 200 of the cars sold in the first year that the extended warranty was available. For this sample, the average extended-warranty expenditure per car for the one-year period after the initial warranty elapsed was $350., with a standard deviation of $100.
a. What is a 95 percent confidence interval for the mean one-year extended-warranty expenditure per automobile?
b. At its introduction, the extended warranty was priced at $224 per year per automobile. Compute a 95 percent confidence interval for the one-year profitability of the extended warranty.
c. How large a sample would the Warranty Department require if it wanted its 95 percent confidence interval for the mean warranty expenditure to be no more than+_$5.
When rewriting an exponential expression that has a negative exponent and a positive base to an exponential expression containing a positive exponent, does the sign of the base change? Demonstrate with an example.
Gilbert Moss and Angela Pasaic spent several summers during their college years working at archaeological sites in the Southwest.
Compute the derivative of the function using the difference quotient and find the equation of the line that is tangent to its curve for x=c
Find the distance.
If a 90% confidence interval for the true mean wingspan for all dragonflies is calculated, do you expect this interval be wider or narrower than the interval obtained in part (a)? Why?
Let phi : R^2 --> R be a function given by phi(x,y) = x^3 + xy + y^3 +1 For which points p =(0,0) , p=(1/3,1/3), p =(-1/3,-1/3) is the subset phi^-1 ( phi(p)) an imbedded sub-manifold of R^2.
Work out the amount of alcohol I would need to add to a 2:8 solution of chloroform with alcohol in a total volume of 50ml.
Using the graphs from part 3 compare the profits of each company and evaluate their claims. Which model seems more realistic, the linear or radical model, and why?
Effectiveness of a disease management program
checking account with a 5.5% annual interest rate if the balance exceeds 1000.00. there is an 8.00 monthly fee is the balance falls below 1000.00. the average monthly balance is 1160.00. the account fell below the minimum balance 4 months. What is..
find the dimensions of a rectangle whose length is 5 more than its width and whose area is 91 square inches.
Write a Matlab script to do the following. Assign m and n to 3 and 4 respectively, create a m by in matrix with terms a_ij=i*j and call t A and then multiply A by random 4x4 matrix
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