In a restaurant, the proportion of people who order coffee with their dinner is .9. A simple random sample of 144 patrons of the restaurant is taken.
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a. |
What are the expected value, standard deviation, and shape of the sampling distribution of ? |
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b. |
What is the random variable in this problem? Define it in words. |
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c. |
What is the probability that the proportion of people who will order coffee with their meal is between .85 and .875? |
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d. |
What is the probability that the proportion of people who will order coffee with their meal is at least .945? |