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A producer of breakfast cereals has developed a new style of corn flakes called Krinkly Corn. They would like to know what percent of U.S. moms would prefer Krinkly Corn rather than any of the other three standard brands. They plan to conduct a market survey. They will recruit a sample of moms of size n. They will supply the moms with boxes of corn flakes of all four brands - Krinkly Corn and the three standard brands and ask them to try all four for their family's breakfast during the next two weeks. After the two weeks they will ask, "Which brand do you prefer (choose one)". They would like to have a confidence interval for the percentage of American moms who prefer Krinkly Corn. They want a 95% confidence interval with a margin of error of about ± 3%. Based on prior experience they guess that about 10% of American moms will prefer Krinkly Corn. How large a sample size, n, should they recruit in order to obtain a confidence interval with margin of error ± 3% based on this prior guess?
A professor needs to select a volunteer for a project .which of the following would not be an example of a simple random sample ?A)he chooses a number between 00 and 99.
Testing equality of variances - evidence of a difference in the variability of monthly talking time on cell phones for men and women?
Is there good evidence that treatment of staph-positive patients before surgery reduces the rate of post-surgical staph infection?
The table below shows the probability distribution of the annual sales (in Millions) of a small rm. Calculate the Expected value, Variance, and Standard deviation of the annual sales?
You are dealt 2 cards from a shuffled deck of 52 cards, without replacement. There are four suits of 13 cards each in a deck of cards
A sample of 23 European countries found that variance of life expectancy was 7.3 years. Determine the 95% confidence interval estimate for variance of life expectancy in Europe?
When the necessary conditions are met, a two-tail test is being conducted to test the difference between two population proportions.
In the wine industry, there is interest in knowing ahead of time if a particular vintage will result in good bottles of wine or bad bottles. There is no way to know if the wine is good until it is finished aging.
Assume that the result is a sample size beyond what you can obtain. Use the compromise function to compute alpha and beta for a sample approximately half the size.
You want to show an increase in buying and selling of single-family homes this year when compared with last year's rate.
Failure testing of a steel alloy resulted in the following S-N curve:N=(1.23*10^28)S^-14.85
A certain type of lightbulb has an average life of 500 hours with a standard deviation of 100 hours. The length of life of the bulb can be closely approximated by a normal curve.
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