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A popular online retailer uses data-mining techniques to "up-sell" to customers who make purchases on its site. When a customer makes a purchase, the site suggests additional items for the customer's consideration. In a random sample of 200 customers, it was observed that 11 took the suggestions to heart and made additional purchases. A 90% confidence interval for the proportion of customers who make additional purchases would have lower and upper limits of, respectively, __________ and __________.
a computarized airline reservation syetem has a main computer on-line and secondary standby computer. the secondary
the project requires you to use the statistical techniques learned in this class. you may make up data as you like
Are people who live at higher altitudes slimmer?- Is there any evidence to suggest that the people living in Denver are thinner?
An independent-measures t test produced a t statistic with df=20. If the same data had been evaluated with an analysis of variance, what would be the df values for the F-ratio?
Obtain an explicit expression for the reliability of a system consisting of a parallel arrangement of two components, C1 and C2 , with respective reliabilities, R1 and R2. Explain in words what the expression for the system reliability means in terms..
What is the range of maintenance costs? What is the standard deviation? About 95 percent of the maintenance costs are between what two values?
The operation manager at a tire manufacturing company believes that the mean mileage of a tire is 20,138 miles. With a variance of 10,304,100. What is the probability that the sample mean would be less than 19,448 miles in a sample of 171 tires if..
Using the .05 level, what should the experimenter conclude? (a) Use the steps of hypothesis testing, (b) sketch the distributions involved.
Here are the annual numbers of deaths from tornadoes in the United States from 1990 through 2000.- Find these statistics by hand (no calculator!):- mean- median and quartiles.
a. What is the probability that the selected student is a male? b. What is the probability that the selected student is in the College of Agriculture? c. What is the probability that the selected student is a male in the College of Agr..
suppose that 12 observations are drawn from a normal population. the observations are 15 912 11 8 12 11 7 15 9 6 and
situations comparing two proportions are described. in each case determine whether the situation involves comparing
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