The State Transportation Department wishes to estimate the mean speed of vehicles on a certain stretch of highway. They wish to estimate the mean within ±0.75 mph and they wish to have a confidence level equal to 99 percent. Based on this information only, they can determine that the required sample size is 320 vehicles.

Question

Quizplus · Accepted Answer

The information provided does not include the population standard deviation or an estimate of it, which is necessary to calculate the required sample size for estimating the mean speed of vehicles with a specified margin of error and confidence level.

The State Transportation Department Wishes to Estimate the Mean Speed