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Advertisers. Direct mail advertisers send solicitations ("junk mail") to thousands of potential customers in the hope that some will buy the company's product. The re- sponse rate is usually quite low. Suppose a company wants to test the response to a new flyer and sends it to 1000 peo- ple randomly selected from their mailing list of over 200,000 people. They get orders from 123 of the recipients.
a) Create a 90% confidence interval for the percentage of people the company contacts who may buy something.
b) Explain what this interval means.
c) Explain what "90% confidence" means.
d) The company must decide whether to now do a mass mailing. The mailing won't be cost-effective unless it pro- duces at least a 5% return. What does your confidence in- terval suggest? Explain.
a committee of 2 is chosen at random from a population of 4 men and 5 women. what is the probability that the committee
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Finding the probability of each event in a group of events of different possibility
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Determine the probability that mean annual snowfall during 40 randomly picked years will exceed 111.8 inches?
The probability of having a particular genetic disorder is 0.004. If 25 patients are tested for this disorder, what is the probability that 2 of them have this disorder?
Suppose that you work for a newly restructured automotive company with nearly 100,000 employees. You are in charge of purchasing engines from an overseas supplier. Company policy is that you purchase several hundred engines each month to be placed in..
Test the hypothesis that the average price is higher than $1.87. Use level of significance α = 0.05.
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
a group of researchers conducted an experiment to determine which vaccine is more effective for preventing getting the
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