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A restaurant owner wishes to find the 99% confidence interval of the true mean cost of a dry martini. How large should the sample size be if she wishes to be accurate within $0.10. A previous study showed that the standard deviation of the price was $.12.
You are the owner of a small casino in Las Vegas. You want to reward high rollers who come to your casino. You want to give free accomodations to no more than 10% of your patrons. Suppose that the mean amount wagered by all patrons is $287 with a ..
A bus arrives at a bus stop at a uniformly distributed time over the interval 0 to 1 hour. A passenger also arrives at the bus stop at a uniformly distributed time over the interval 0 to 1 hour.
How to explain the influences on z-scores with constant variables in hypothesis tests with
Milligrams with standard devation s=1.0 milligram. construct a 95% confidence interval for the difference between the mean nicotine content of two brands of cigarettes.
Multiple choice questions based on F-distribution.
If profit earned in the manufacture and sale of X units of a product is P dollars where: P = 10X - 0.001X2
Suppose that the number of cars, X, that pass through a car wash between 4:00pm and 5:00pm on any sunny Friday has the following probability distribution:
For an independent-measures ANOVA comparing three treatments with a sample of n = 5 in each treatment, what is the critical value for the F-ratio using a = .05?
The standard deviation of the ages of a sample of 21 executives from the northern states was 8.4 years; while the standard deviation of the ages of a sample of 30 executives from southern states was 12.8 years.
Suppose you were trying to decide which of two machines to purchase. Furthermore, suppose the length to which the machines cut a particular product part was important. If both machines produced parts that had the same average length, what other co..
Each day the major stock markets have a group of leading gainers in price (stocks that go up the most). On one day the standard deviation in the percent change for a sample of 10 NASDAQ leading gainers was 15.8.
A random sample of 225 SAT scores has a mean of 1522. Assume that SAT scores have a population standard deviation of 300. construct a 95% confidence interval estimate of the mean SAT scores.
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