### Computing confidence interval for a confidence level

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A random sample of 40 new cars was taken with a mean dealer sticker price of \$24,310. Assuming that the population standard deviation is σ = \$7,200, find the confidence interval for the mean price, μ, of all dealer sticker prices of new cars: for a confidence level of 90% in thousands of dollars:

In the above problem, suppose σ was not given. You have computed the sample standard deviation to be s = \$7,350. Assuming the sample size of 40 can be considered as large, compute the confidence interval for a confidence level of 90%.

(22.40, 26.24)

(22.08,  26.54)

(20.44),  28.18)

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