Example 12.15 Suppose a company manufacturing automobile tyres finds that tyre-life is normally dis- tributed with a mean of 40, 000 km and standard deviation of 3000 km. The company has developed a new tyre. On the basis of a sample of 100 new tyres, the company has found that the mean life of new tyres is 40,450 km. Can it be concluded that the new tyre is significantly better than the old one, using the significance level of 0.05?

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Example 12.15 Suppose a company manufacturing automobile tyres finds that tyre-life is normally dis-
tributed with a mean of 40, 000 km and standard deviation of 3000 km. The company has developed a
new tyre. On the basis of a sample of 100 new tyres, the company has found that the mean life of new
tyres is 40,450 km. Can it be concluded that the new tyre is significantly better than the old one, using
the significance level of 0.05?
Transcribed Image Text:Example 12.15 Suppose a company manufacturing automobile tyres finds that tyre-life is normally dis- tributed with a mean of 40, 000 km and standard deviation of 3000 km. The company has developed a new tyre. On the basis of a sample of 100 new tyres, the company has found that the mean life of new tyres is 40,450 km. Can it be concluded that the new tyre is significantly better than the old one, using the significance level of 0.05?
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