According to a National Survey, the Average Commuting Time for People

Short Answer

According to a national survey, the average commuting time for people living in a city with a population of 1 to 3 million is 19.0 minutes. Suppose a researcher lives in a city with a population of 2.4 million and wants to test this claim for her city. Taking a random sample of 20 commuters, she calculates a mean time of 19.346 minutes and a standard deviation of 2.842 minutes. Test the hypotheses that the commuting time in this city is different from the average 19 minutes at α = .10 using the critical value rule.