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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?
While purchasing a home, location is everything. As a buyer, one should be aware of the cost of living in the area of choice, as well as expect a higher cost the closer to the center of town you get.
The table below contains the opinions of a sample of 200 people (broken down by gender) about the latest congressional plan to fund abortion clinics.
When sampling is done for the proportion of defective items in a large shipment, where the population proportion is 0.18 and the sample size is 200, what is the probability that the sample proportion will be at least 0.20?
Suppose that in order to satisfy legal requirements, a meat pie manufacturer may only produce .2% of pies below a weight of 750grams. If the preceding holds and if the weight of all pies is normally distributed with a standard deviation of 50 gram..
Assume that the annual rate of return for a common biotechnology stock is normally distributed with a mean of 5.5% and a standard deviation of 6%.
Determine the standard score for the value x=452 realative to its sample, where the sample mean is 500 and the standard deviation is 32.
What fraction of the calls last between 4.2 and 5 minutes?
If we select a crew member at random, what is the probability the crew member earns:
A prestigious university requires a score of at least 750 on a graduate exam for admission to its MBA program. Suppose the graduate exam is normally distributed with a mean of 500 and a standard deviation of 200.
Suppose an appliance manufacturer is doing a regression analysis,using quarterly time-series data, of the factors affecting its sales of appliances.
Consider a binomial distribution with 15 identical trials, and a probability of success of 0.5. Find the probability that x = 2 using the binomial tables
What is the city mileage standard deviation for this SUV model?
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