Find a confidence interval for

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.First determine which scenario you are working with.

a. A recent sample 88 used car saleshad a mean of$

$

6390, with a standard deviation of$

$

3170. Use this sample data to construct a 95% confidence interval for the population mean cost of a used car. You may assume the parent population is normally distributed. Round to one decimal place.

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b. A survey of 1025 U.S. adults were asked if they buckled up their seat belt when they drove a car.Of those surveyed, 829 claimed they always buckled up. Use this data to construct a 90% confidence interval for the population proportion of all U.S. adults who claim to buckle up their seat belts when they drive. Answer using decimals and round to 4 decimals.

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c. A sample of 20 small bags of M&M's was selected. Assume that the population distribution of bag weights is normal. The weight of each bag is recorded and found to have a mean of 2 oz. There is a known population standard deviation of 0.12 oz.Use this data to construct a 99% confidence interval forthe population mean weight of the bags of candies.Round your answers to one decimal.

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