Question

The gas mileage for a certain model of car is known to have a standard deviation of 4 mi/gallon. a simple random sample of 64 cars of this model is chosen and found to have a mean gas mileage of 27.5 mi/gallon. construct a 96.5% confidence interval for the mean gas mileage for this car model.

Answer 1

Now, to increase the confidence interval to 96% the mean difference should be greater thus allowing the data to behave a greater discrepancy. The Standard Deviation is a measure of how spread out numbers are. Hope this answer has helped you. Have a good day!