What units represent the margin of error? suppose you want, Ask an Expert

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Calculate the correlation of the data set (3,2), (3,3), (6,4).

A 95% confidence interval for the average miles per gallon for all cars of a ginven type is 32.1 plus/minus 1.8. The interval is based on a sample of 40 randomly selected cars.

What units represent the margin of error?

Suppose you want to decrease the margin of error, but want to keep the 95% confidence interval. What do you need to do?

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