Because of a merger, a Vancouver executive will commute regularly to San Francisco for important meetings. To plan for travel time, she has compiled, as shown, a sample of flight times, in hours, for flights from Vancouver to San Francisco (based on data from Gary Murphy, chief flight dispatcher, Air Canada). The most convenient flight takes off 2.4 hours before she must reach San Francisco. Test the claim that the mean flight time from Vancouver to San Francisco is less than 2.4 hours. Because of the importance of not being mistaken, use a 0.01 level of significance.

Use the traditional approach summarized in Figure 7-4. Draw a graph showing the test statistic and critical values. In each case, assume that the population has a distribution that is approximately normal and that the sample is randomly selected.

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2.30 2.20 1.97 2.22 2.12 x=2.1564 1.95 2.03 2.30 2.15 2.33 $=0.1312 2.15