In a study of the relationship between pet ownership and physical activity in ol

Question

In a study of the relationship between pet ownership and physical activity in older adults, 615 subjects reported that they owned a pet, while 1937 reported that they did not. Give a 98%confidence interval for the proportion of older adults in this population who are pet owners. (Round your answers to three decimal places.)

One of your employees has suggested that your company develop a new product. You decide to take a random sample of your customers and ask whether or not there is interest in the new product. The response is on a 1 to 5 scale with 1 indicating "definitely would not purchase"; 2, "probably would not purchase"; 3, "not sure"; 4, "probably would purchase"; and 5, "definitely would purchase." For an initial analysis, you will record the responses 1, 2, and 3 as "No" and 4 and 5 as "Yes." What sample size would you use if you wanted the 95% margin of error to be 0.2 or less? (Round your answer up to the next whole number.)

participants

An automobile manufacturer would like to know what proportion of its customers are dissatisfied with the service received from their local dealer. The customer relations department will survey a random sample of customers and compute a 95% confidence interval for the proportion that are dissatisfied. From past studies, it believes that this proportion will be about 0.21. Find the sample size needed if the margin of error of the confidence interval is to be no more than 0.035. (Round your answer up to the next whole number.)

customers

Explanation / Answer

Hence 24 samples would be selected.

sample size = 520

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