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The Environmental Protection Agency (EPA0 estimated that the 1994 Polaris automobile obtains a mean of 35 miles per gallon (mpg) on the highway. However, the company that manufactures the car claims that the EPA has underestimated the Polaris' mileage. To support its assertion, the company selects 50 1994 Polaris cars and records the mileage obtained for each car over a driving course similar to the one used by the EPA. From the sample, the mean was 38.2 mpg. Assume the population standard deviation is 7.1 mpg.
a. State the correct null and alternative hypotheses that the company wishes to test.
b. Calculate the test statistic that would be used for conducting the desired test.
What is the probability that a consumer buys a can whose contents are actually less than the stated weight of 16 oz.?
Normally distribution with µ=8 minutes and σ=2 minutes. If you select random samples of 25 calls, what percentage of the sample means would be between 7.8 and 8.2 minutes?
The quality control engineer for a furniture manufacturer is interested in the mean amount of force necessary to produce cracks in stressed oak furniture.
What is the probability the number of fatal crashes will be between 1000 and 2000 for a year?
A random sample of 1000 college students ages from 18-25 revealed that 234 voted for the American Idol. Similarly, 198 college students stated they voted in the 2006 midterm elections.
What are the assumptions necessary to use the z-series test? What are the assumptions necessary of use the t-series test?
Markets can be segmented by the following variables: geographic, demographic, social, or behavior. If you were to select a segmentation variable suited best for the motorcycle market, which variable would you select?
Identify the null hypothesis, alternative hypothesis, test statistic, P-value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim.
Does the sample show sufficient reason to conclude that the population standard deviation is not equal to 8 at the 0.05 level of significance?
What is the standard error of estimate and suppose a large sample is selected and about 95 percent of the predictions would be between what two values.
The plant manager wants to evaluate the capability of a critical cutting operation that he suspects might be the source of the gap problem. The nominal specification for this cutting operation is 25.500 inches.
Describe the difference in the fit provided by the two estimated regression equations.
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