## [answered] 1. A slice of pizza in the college Cafe has a mean price of

1.?A slice of pizza in the college Cafe has a mean price of \$2.75 with a standard deviation of \$0.29. If you sample 15 days of pizza sales, what is a 99% confidence interval for the price of pizza?

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2.?Six different national brands of chocolate chip cookies were randomly selected at the supermarket. The grams of fat per serving are as follows: 8; 8; 10; 7; 9; 9. Assume the underlying distribution is approximately normal. Find the 90% confidence interval for the mean number of grams of fat per serving. (Hint: Use Minitab to find the mean and standard deviation!)

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3.?Stanford University conducted a study of whether running is healthy for men and women over age 50. During the first eight years of the study, 2.5% of the?625 members of the 50-Plus Fitness Association died. We are interested in the 99% confidence interval of the?proportion of people over 50 who ran and died in the same eight-year period.
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4.?Travelers are asked?how many hours they are willing to drive while on vacation in one day.?A total of 86?travelers reported a mean of 11.55 hours with a standard deviation of 1.2 hours. Find the 99% confidence interval for the mean number of hours travelers are willing to drive.

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5.?18% of the students at Brockport College live in within five miles of the campus. You take a sample of?84 students. What is the 85% confidence interval for the population?proportion?of students who live within five miles of the campus?

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6.?A soccer ball manufacturer wants to estimate the mean circumferance of mini-soccer balls withing 0.15 inch. Determine the minimum sample size needed to construct a 99% confidence interval for the population mean. Assume that the population standard deviation is 0.20 inch.

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7.?A camp director is interested in the average number of letters each child sends during his/her camp session. The population standard deviation is known to be 2.5. A survey of 45 campers is taken. The average from the sample is?6.75 with a sample standard deviation of 3.1. Find the 95% confidence interval for the population mean.

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