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Sample Size for Motor Vehicle Ownership: You have been hired by the Ford Motor Company to do market research, and you must estimate the percentage of household in which a vehicle is owned. How many households must you survey is you want to be 94% confident that your sample percentage has a margin of error of three percentage points?
a) Assume that a previous study suggested that vehicles are owned in 86% of households.P= .86, q= .14, n= 473Thus, there are about 473 households must be survey.b) Assume that there is no available information that can be used to estimate the percentage of households in which a vehicle is owned.
Suppose that the mortgage payments of all homeowners have a normal distribution. What is the mean monthly mortgage paid by all homeowner?
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The number of passengers on the Carnival Sensation during one-week cruises in the Caribbean follows the normal distribution.
A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours. A random sample of 50 bulbs burned out with a mean life-span of 2,470 hours and a sample standard deviation of 140 hours.
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Given that Z is standard normal randam variable. Compute the value of Z if area between –Z and Z is 0.754:
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An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
21 percent of the employees in a company have managerial positions, and 31 percent of the employees in the company have MBA degrees. Also, 66 percent of the managers have MBA degrees. Using the probability formulas, find the proportion of employee..
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