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The manufacturer of a gasoline additive claims that the use of additive increases gasoline mileage. A random sample of eight cars were selected and these cars were driven for one week without petrol additive and then for one week with petrol additive. The following gives the miles per liter for...

According to a survey, 63% of men and 67% of women drivers always use seat belts. Suppose these results were obtained from samples of 1200 men drivers and 1000 women drivers, respectively. Test at 1% significance level that there exists a difference in proportion between men and women drivers...