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Xerox Claims their copier is the same speed as Cannon's copier. The average speed of cannon's copier is 27 copies per minute. A test of 49 runs is done on the Xerox copier giving a sample mean X = 26 and a sample standard deviation s = 2.65. Using the significance level  = .02, and assuming a normal distribution what does the evidence conclude about the two machines.
What are the minimum and maximum heights it should use as a basis for its design?
Each undergraduate course taught cost the college an average of $2,500 in faculty wages, and each graduate courses cost $ 3,000. How many undergraduate and graduate courses should be taught in the fall so that the total faculty salaries are kept t..
Suppose that Total Revenue = 200Q and Total Cost = 80 + 50Q where Q, the quantity sold, is a random variable with expected value 20 and variance 4.
A state meat inspector in lowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled " 3 pounds." Of course, he realizes that the weights cannot be precisely 3 pounds.
We are interested in determining if the accident proportions differ between the two age groups:
When the non-parametric statistics utilized? Write down an example.
Assume that waiting times are approximately normally distributed. Construct a 98% confidence interval for the population mean of waiting times.
You are the owner of a small casino in Las Vegas. You want to reward high rollers who come to your casino. You want to give free accomodations to no more than 10% of your patrons. Suppose that the mean amount wagered by all patrons is $287 with a ..
the population mean of monthly wages of all college graduates under age of 30. Interpret your answer in the context of the problem.
A sociologist wishes to conduct a poll to estimate the percentage of Americans who favor affirmative action programs for women and minorities for admissions to colleges and universities.
Enter the data into R, and calculate the means for placebo and epinephrine. Find a 95% confi dence interval for the mean difference in cholesterol levels between the placebo and epinephrine. Use the confi dence interval to test your null hypothes..
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
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