Exhibit 6-5

question 85

Multiple Choice

Exhibit 6-5.The mean travel time to work is 25.2 minutes (U.S.Census 2010) .Further,suppose that commute time follows a log-normal distribution with a standard deviation of 10 minutes. Refer to Exhibit 6-5.What is the probability a randomly selected U.S.worker has a commute time of less than 20 minutes?

• A)30.15%
• B)34.09%
• C)65.91%
• D)69.85%

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Definitions:

Proportion Difference

The difference in proportions (or percentages) between two groups in a study, used to assess the effect of a treatment or intervention.

Canadians

Residents or citizens of Canada, a country in North America.

Americans

Citizens or natives of the United States of America.

P-value

The probability of obtaining test results at least as extreme as the ones during the test, assuming that the null hypothesis is true.