Mathematics, 14.04.2020 23:35 lizzidubois

The Highway Safety Department wants to study the driving habits of individuals. A sample of 40 cars traveling on a particular stretch of highway revealed an average speed of 69 miles per hour with a standard deviation of 7.8 miles per hour. Round to 4 decimal places.

What sample size is needed to estimate the true average speed to within 2 mph at 99% confidence?

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The Highway Safety Department wants to study the driving habits of individuals. A sample of 40 cars...