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Direct mail advertisers send solicitations (a.k.a. junk mail ) to thousands of potential customers in the hope that some will buy the company s product. The acceptance rate is usually quite low. Suppose a company wants to test the response to a new flyer, and sends it to 1000 people 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 produces at least a 5% return. What does your confidence interval suggest? Explain.
(d) the value of K to yield a steady-state error of 25% of the magnitude A for the ramp input r(t) - At t > 0. Can this gain be utilized and achieve acceptable performance?
Construct a 99% confidence interval for the difference in the probabilities of getting a fracture for non-cola drinking and cola drinking kids.
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one key risk factor for type ii diabetes is obesity and the cdc defines obesity as having a body mass index bmi of 30
A decade-old study found that the proportion, p, of high school seniors who believed that "getting rich" was an important personal goal was 75%. A researcher decides to test whether or not that percentage still stands.
State the appropriate null and alternative hypothesis for the following case: The examinations in a large freshmen chemistry class are scaled after grading.
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Six houses were selected and each appraiser provided an appraisal for each of the six houses. What would be the best statistical test to use for the analysis of this data?
A large population of overdue bills has balances that follow a normal curve. When we take a sample of 100 of these the average is $500 and the SD is $100.
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