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An attorney claims that more than 20% of all lawyers in his city advertise. A sample of 200 lawyers in his city showed that 50 had used some form of advertising
Suppose the coach of the football team wants to estimate the proportion of the population of fans who support his current starter lineup.
At the downtown office of First National Bank, there are five tellers. Last week, the tellers made the following number of errors each: 2, 3, 5, 3, and 5.
Compute the standard error of x using the finite population correction factor
In this problem set you will get some practice performing hypothesis tests for two samples. If you use Statdisk to perform any portion of these analyses
A sample of 25 MBA students taking OTM course in the Spring of 2013 shows an average income of $85,000 with the sample standard deviation of $5,000
If Z is a standard normal variable, find the probability.
Credit card companies use a scoring model to determine the credit worthiness of a prospective card holder
The average expenditure on Valentine's Day was expected to be $100.89 (USA Today,| February 13, 2006). Do male and female consumers differ in the amounts
A sample of 400 bags of dog food which are advertised to contain twenty-five pounds had a mean content weight of 24.5 pounds with a standard deviation
In an article in Accounting and Business Research, Carslaw and Kaplan investigate factors that in?uence "audit delay" for ?rms in New Zealand
In a study, the carapace lengths (in mm) of Thenus lobster caught near Singapore measured: 78,66,65,63,60,60,58,56,52 and 50
Let X equal the weight in grams of a 52-gram snack pack of candies. Assume that the distribution of X is N(µ, 4)
In his management information systems textbook, Professor David Kroenke raises an interesting point:
The Kwik Klean Car Wash loses $30 on rainy days and gains $120 on days when it does not rain. If the probability of rain is 0.15, what is the expected value
A tire company made a sampling distribution on one of its brands of tires and determined that the tire had a mean life of 56,000 miles with a standard deviation
The probability that a person is immune to a certain disease is 0.40.
Acme Plumbing Supply has just received a shipment of 5,000 valves for chemical plants, where regular steel valves would corrode.
Let X be a Poisson random variable with parameter (lambda). Show that P {X=i} increases monotonically and then decreases monotonically as i increases
The manager of a restaurant claims that only 3% of the customers are dissatisfied with the service. If this claim is true, what is the probability
Merican air flight 2705 from N.Y. to San Francisco has seats for 340 passengers. An average of 7% of the people with reservations do not show up
Determining whether rain on consecutive days is an independent phenomenon
A researcher is studying IQ levels. From past experience she knows the population mean IQ for adults is 110 and the standard deviation is 15.
A survey of workers in the U.S. found that 2.9% work more than 70 hours per week. You randomly select 10 workers in the U.S
A coin is tossed 20 times. Find probability of getting at least 14 heads.