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The Highway Safety Department wants to study the driving habits of individuals. A sample of 18 cars traveling on the local road revealed an average

The Highway Safety Department wants to study the driving habits of individuals. A sample of 18 cars traveling on the local road revealed an average speed of 39 miles per hour with the standard deviation of 6 miles per hour. Round your answers off to the nearest mph.

  • What is the Margin of Error (MOE) if a 95% confidence interval is desired?
  • What is a 95% confidence interval (CI) estimate for the mean speed of the cars?
  • How large the sample must be in order to obtain 97% confidence interval with margin of error equal to 2 miles per hour.

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