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b) An engineer studying whether a downhill section of a highway needs to be widened, measures the speed of motorists travelling along the highway. A

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b) An engineer studying whether a downhill section of a highway needs to be widened, measures the speed of motorists travelling along the highway. A sample of 90 cars gives a mean speed of 110.2 km/h and a standard deviation of 6 km/h. Summary Output 3.3 and 3.4 was obtained Summary Output 3.3: | Summary Output 3.4: One-Sample T | One-Sample T Test of mu = 112 vs not: 112 | Test of mu = 112 vs

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