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Consumer products companies design different promotional activities to accomplish different goals. According to a spokesperson for General Mills, the company's cents-off coupon offers are designed to convince people to buy its products, while its refund offers (money returned with proof of repeated purchases) are designed to encourage people to continue buying its products. However, these promotional activities are only effective if consumers participate.
In a survey of 562 randomly selected households in the Research Triangle Area (Raleigh, Durham, and Chapel Hill) in 2003, 427 principal shoppers (the person in the household who does the majority of the grocery shopping) indicated that they used cents-off coupons when they went grocery shopping.
a) What is your best estimate of the proportion of households throughout the Research Triangle Area who use cents-off coupons when grocery shopping?
b) Develop a 99% confidence interval for the proportion of households throughout the Research Triangle Area who use cents-off coupons when grocery shopping.
c) Suppose it is desired that the 99% confidence interval be of the form "plus or minus 0.03." How large a sample is required?
Compute fraction of the employees cost between $1,500 and $2,000 per year? Evaluate percent that didn't have any dental expense.
Simulate both one-and two-teller systems, calculate waiting time, average queue length, and percentage utilization for each system.
A large internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days.
A researcher believes that if she uses a different text the students will score differently on the standardized test but she doesn't know what the difference is.
Use three decimal places in your answers for this problem. The following table was collected.
Suppose that a study based on a sample from a targeted population shows that people at a pizza restaurant are hungrier than people at a coffee shop. make an interference based on the results of the study.
An independent researcher has decided to study variations in TV viewing habits among three American cities. She has managed to randomly sample households in Chicago, Atlanta, and Minneapolis and gather data on the daily "on" times for households o..
Test hypothesis that Site B is more successful in initiating acquaintances than Site A. Use alpha = .05.
The average number of days absent per student per year at West Valley School is 17 days with a standard deviation of 4 days. How many standard deviations from the mean is 6 absent days?
It is estimated that 10 percent of those taking the quantitative methods portion of the CPA examination fail that section. Sixty students are taking the exam on Saturday.
To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
If a statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 48.0 and 53.0 minutes what is the probability that a given class period runs greater than 51.25 minutes.
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