An environmental group at a local college is conducting independent tests to determine the distance a particular make of automobile will travel while consuming only 1 gallon of gas. They test a sample of five cars and obtain a mean of 28.2 miles. How many cars should the environmental group test if they wish to estimate μ, mean miles per 1 gallon, to within .5 miles and be 99 percent confident? Assume a population standard deviation of 2.7 miles.
A) 25
B) 124
C) 194
D) 618
E) 619

Question

Quizplus · Accepted Answer

n = [(z_α_/2 × s)/E]²= (2.576 × 2.7/.5)² = 193.5 = 194

An Environmental Group at a Local College Is Conducting Independent