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According to Road & Track Magazine, the average price for a four-door American-made sedan is $29,445 with a standard deviation of $5,400. A car shopper believes the average price may be different than that and samples 100 cars to test her theory. The sample result shows average price to be $30,700. Develop a critical value test that uses ninety-nine percent confidence to mathematically test this hypothesis. Is the shopper right?
In a recent survey, a company claimed that no more than 40% of all citizens believed the country was in a recession. In a random sample of 375 citizens, 175 stated they believed the country was in a recession. Use a .02 level of significance and test the company's claim based on the critical value.
Assuming that each shirt costs $35, let Y be the total amount of money (in dollars) spent by a customer when he visits this clothing store.
The typical homeowner has a utility function equal to the square root of wealth. Will the homeowner retrofit the house, and if so, which insurance policy will the homeowner buy?
Suppose the amount of minutes used per month is distributed normally with a mean of 700 minutes and a standard deviation of 120 minutes. What is the probability that more than 820 minutes were used?
suppose that we have a sample space s e1 e2 e3 e4 e5 e6 e7 where e1 e2 . . . e7 denote the sample points. the
Find the 90% confidence interval estimate of the population mean. Interpret the interval estimate. 79 43 58 66 101 63 79 33 58 71 60 101 74 55 88.
in boston record game fishes it is stated that in the cozumel region approximately 40 of strikes while trolling result
show that each of the following rules for playing the tower of hanoi works and state the initial conditions for each
4. Why is a 99% confidence interval wider than a 95% confidence interval?
Find a 98% confidence interval for the true proportion of students who have a personal blog with a maximum margin of error of 0.03. How many students do you survey?
the upper limit of the 95 confidence interval for the population proportion p given that n 300 and hat p 0.10 is
Make a time plot of the mean scores, by hand. This is just a scatterplot of score against year. There is a slow linear increasing trend.
An archer's standard deviation for his hits is six (data is measured in distance from the center of the target). An observer claims the standard deviation.
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