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1. Citibank Visa gives its cardholders "bonus dollars," which may be spent in partial payment for gifts purchased with the Visa card. The company wants to esti- mate the average amount of bonus dollars that will be spent by a cardholder enrolled in the program during a year. A trial run of the program with a random sample of 225 cardholders is carried out. The results are x = $259.60 and s = $52.00. Give a 95% con?dence interval for the average amount of bonus dollars that will be spent by a cardholder during the year.
2. An accountant wants to estimate the average amount of an account of a ser- vice company. A random sample of 46 accounts yields x = $16.50 and s = $2.20. Give a 95% con?dence interval for the average amount of an account.
A researcher selects a random example of college students and measures number of hours they spend watching television per week and their grade point average.
College graduates, and half of the college graduates are married. What is the probability that a randomly chosen worker is: Neither married nor a college graduate?
If the sample standard deviation is s = 10, are the data sufficient to conclude that the treatment has significant effect using a two-tailed test with α = .05?
Managerial accounting is all about making informed decisions. Cost-volume-profit (CVP) analysis is one of the most powerful tools available for managers to crunch numbers, gain a thorough understanding of a situation, and perform a what-if analysi..
A research study reports t(14) = 2.17. How many individuals participated in the study? Is this t statistic sufficient to reject the null hypothesis using a two-tailed test with alpha = 0.05?
What is the probability of correctly guess the right code on the first try? What is the probability of not correctly guessing the right code o the first try?
Brain cancer is a rare disease. In any year there are about 3.1 cases per 100000 od population. Suppose a small medical insurance company has 150000 people on its books.
1. thirty eight percent of young adults say they use credit cards because of the rewards program. seven young adults
70 of the student body of a very large post-secondary institution is female. in a random sample of 12 students what is
The time in minutes until the paint was dry enough for a second coat to be applied was recorded. The following data were obtained. Test to see whether the mean drying time is the same for each type of paint.
Two new york designs are under consideration for possible adoption in an assembly plant. A time study is conducted with 10 workers using design 1, and 12 workers using design 2. The means and standard deviation of their assembly times in minutes a..
in a recent survey of full-time female workers ages 22 to 35 years 46 said they would rather give up some of their
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