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The manufacturer of Winston Tire Company claims its new tires last for an average 40,000 miles. An independent testing agency road-tested 20 tires to substantiate the claim made by the Winston Tire Company. The sample mean was 39,000 miles with a sample standard deviation of 5,000 miles. Using the .05 level of significance and the five-step hypothesis testing procedure, determine if there is reason to reject the claim made by Winston Tire Company and conclude that tires last for less than 40,000 miles.
If represents the true average gas mileage for this new model, which of the following gives the null and alternative hypothesis that the CONSUMER group should test?
An investment counselor would like to meet with 14 of his clients on Wednesday, but he only has time for 10 appointments. How many different combinations of the clients could be considered for inclusion into his limited schedule for that day?
There is concern about the percent of on-time flights. A recent survey of two major airlines yielded the following results. At α = 0.05 test the claim that there is a difference in proportions of on-time flights.
What is the standard error of measurement for the test? What range of scores would you expect an individual who made 54 on the test to make on another test of similar difficulty? Assume you want to be 68% accurate in your estimate.
The one-sample t statistic has the value t = -1.68. What do we know about the P -value of this test?
Random sample of workers at each of three plants. Research question: Are the mean hourly productivity levels the same for workers in these three plants?
The bin with replacement, find the probability that all the bulbs selected are good ones. Round to the nearest thousandth if necessary.
People assigned to assemble circuit boards for a computer manufacturing company under go on the job training. From past experience it was found that the learning curve for the average employee is given by:
What are the endpoints of a 95 percent confidence interval for the proportion defective. (Round your answers to 3 decimal places).
A person purchased a slot machine and tested it by playing it 1,245 times. There are 10 different categories of outcomes, including no win, win jackpot, win with three balls, and so on.
Can we conclude that the mean time for a game is less than 3.50 hours? Use the .05 significance level.
A group of young businesswomen wish to open a high fashion boutique in a vacant store, but only if the average income of households in the area is at least $25,00.A random sample of 9 households showed the following results:
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