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. Assuming that the population standard deviation is 2.7 miles, find the 95 percent confidence interval for the mean distance traveled by all such cars using 1 gallon of gas.
A) [26.16, 30.24]
B) [20.70, 35.70]
C) [24.85, 31.55]
D) [26.70, 29.70]
E) [25.83, 30.57]

Question

Quizplus · Accepted Answer

[± ] = [28.2 ± 1.96(2.7/ 2.236)] = [28.2 ± 2.367] = [25.83, 30.57]

An Environmental Group at a Local College Is Conducting Independent