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Gamma Corporation is considering the installation of governors on cars driven by its sales staff. These devices would limit the car speeds to a preset level, which is expected to improve fuel economy. The company is planning to test several cars for fuel consumption without governors for 1 week. Then governors would be installed in the same cars, and fuel consumption will be monitored for another week. Gamma Corporation wants to estimate the mean difference in fuel consumption with a margin of error of estimate of 2 mpg with a 90% confidence level. Assume that the differences in fuel consumption are normally distributed and that previous studies suggest that an estimate of sd=3sd=3 mpg is reasonable. How many cars should be tested? (Note that the critical value of tt will depend on nn, so it will be necessary to use trial and error.)
The reason why we finish our calculation by dividing range by 4 is that in most data sets 95% of the data values fall within two standard deviations of the mean.
a bag contains 10 red 12 green and 8 yellow marbles. assuming that all the marbles are equally likely to be picked from
1. a poll found that in a random sample of 1000 american adults 720 indicated that they oppose the reinstatement of a
Using a 5% level of significance, is there any difference in proportion of guests who would select the two resorts? What is your conclusion?
The sample included all workers for a tunnel construction company who received medical examinations as part of routine health checkups. Discuss the extent to which you think these results apply to other, similar types of workers.
To what extent have increases in U.S. real GDP resulted from more labor inputs? From higher labor productivity?
The level of calcium in the blood in healthy young adults varies with mean about 9.5 milligrams per deciliter and standard deviation about σ = 0.4. A clinic in rural Guatemala measures the blood calcium level of 160 healthy pregnant women at their..
Government Programs This chapter described many forms of government insurance and guarantee programs. What motivates a government to establish such programs?
They estimated the proportion of students at the university who prefer outdoor exercise as (0.5745, 0.8217), with 95% confidence. Which of the following is an appropriate interpretation of this confidence interval?
What is the 95% confidence interval for the difference between the mean prices of the two models?
Refer to given Exercise. For each situation, explain what factors influence customer perception of quality and how they are to be managed.
Please show all work details with answers, insert the graph, and provide answers to all the critical thinking questions on this form for the Unit 3 IP assignment.
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