Question

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8.6 Studying the flow of traffic at two busy intersections between 4 P.M. and 6 P.M. (to determine the possible need for turn signals), it was found that on 40 week- days there were on the average 247.3 cars approach ing the first intersection from the south that made left turns while on 30 weekdays there were on the average 254.1 cars approaching the second intersection from the south that made left turns. The corresponding sam- ple standard deviations are s1 15.2 and s2 18.7 (a) Test the null hypothesis u. u20 against the alternative hypothesis μ1 ..-u-关0 at the level of significance a-0.01 (b) Using 15.2 and 18.7 as estimates of σ1 and σ2 find the probability of failing to reject (accepting) the null hypothesis AIM20 when actually Jul 42 I = 15.6.

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