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The price of a used car depends on the number of miles it has been driven. The association between price and miles is negative and linear.

The price of a used car depends on the number of miles it has been driven. The association between price and miles is negative and linear. Used car companies want to estimate the decrease in price for each mile driven. A confidence interval for which of the following would be the best to use for this estimate?

Options:

μ, when σ is known


μ, when σ is unknown


The true mean of the differences, for paired data

The difference between two means, using independent samples

One proportion

The difference between two proportions

Linear regression

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