A highway inspector needs an estimate of the mean weight of trucks crossing a bridge on the Interstate highway system. She selects a random sample of 49 trucks and finds a mean of 15.8 tons with a sample standard deviation of 3.85 tons. The 90 percent confidence interval for the population mean is
A) 14.72 to 16.88 tons.
B) 14.90 to 16.70 tons.
C) 14.69 to 16.91 tons.
D) 14.89 to 16.72 tons.
RES / 341 RES/341 RES341 RES 341 QUIZ # 3
(Chapters 2+8 from Applied Statistics in Business and Economics )
To View all the Questions covered : 4 sets of RES341 Final
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