A garage offers a ‘clean and green engine makeover’, which it promises will reduce the amount of CO2

A garage offers a ‘clean and green engine makeover’, which it promises will reduce the amount of CO2 emissions from cars. A random sample of ten cars was tested for CO 2emissions before and after the service. The emission figures (in grams of CO2 per kilometre travelled) were: Car 12345678910 Before 174 160 196 214 219 149 292 158 186 200 After 169 158 183 210 204 148 285 155 179 183 Test the hypothesis that after the service emission levels are at least as high as before against the alternative that emission levels are lower. Use a 1 per cent level of significance.

 

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