Question

4. You have been hired by the Ford Motor Company to do market research, and you must estimate the percentage of households in which a vehicle is owned. How to be 99% confident that your sample a. Assume that a previous study suggested that vehicles are owned in 8S% of households (10pts) households mast you survey if you want percentage has a margin of erro rof three percentage points? b. Assume that instead of using randomly selected household readers of the Washington Post newspaper to mail in a survey form. How are the s, the sample data are obtained by asking results affected? (2pts) nitrogen-oxide 5, 0.14,0 5. Estimating Car Pollution: In a emissions (in grams per mile) and the following results were obtained 0.15. Assume the requirements mean amount of n nitrogen-oxid being met? Explain. (15pts) random sample of seven cars, each car was tested for and 0.06, 0.11 rtdence interval estimate of the are met. Construct and rs, If the for all cars. h an Protection Agency requires that for al itrogen- e emissions oxide emissions be less th conc this requirement is 5 grams/mile, can we safely conclude that b. Su heigh

Answer 1

b) It can be biased. Some might not fill the survey form

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