Question: What is the difference between a confidence interval and a hypothesis test? How can you decide which one to use to achieve a useful result?

What is the difference between a confidence interval and a hypothesis test? How can you decide which one to use to achieve a useful result? Which would you use if you wanted to find out if cars were regularly exceeding the speed limit posted near a school? Why? Which one would you use if you wanted to know if the price being asked for a used Ford Mustang is reasonable or what one should expect to be paying for a Ford Mustang? Why?

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