A student organization is planning to ask a sample of 50 students if they have noticed alcohol abuse brochures on campus. The sample percentage who say "Yes" will be reported. The organization's statistical advisor says that the standard deviation of this percentage will be about 7%.

a) What would the standard deviation be if the sample contained 100 students rather than 50?
b) How large a sample is required to reduce the standard deviation of the percentage who say "Yes" from 7% to 3.5%? Explain to someone who knows no statistics the advantage of taking a larger sample in a survey of opinion.

 

Question 4 (Essay Worth 1 points)

You are the new owner of a restaurant. You read that a sample survey by the National Restaurant Association shows that 40% of adults are committed to eating nutritious food when eating away from home. To help plan your menu, you decide to conduct a sample survey in your own area. You will use random digit dialing to contact an SRS of 200 households by telephone.

a) If the national result holds in your area, is it reasonable to use a normal approximation for the sampling distribution? Be sure to justify your response.
b) What is the mean number of nutrition-conscious people in your sample if p = 0:4 is true?
c) What is the probability that X lies between 75 and 85?
d) You found that 100 of your 200 respondents are concerned about nutrition. Is this reason to believe that the percent in your area is higher than the national 40%?

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Status NEW Posted 29 Aug 2017 05:08 PM My Price 8.00

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