Suppose that a random sample of 95 tyres of a certain brand lasted a mean of...
Suppose that a random sample of 95 tyres of a certain brand
lasted a mean of
21,431 kilometres with a standard deviation of 1295 kilometres. At
the 0.01 level
of significance, test the null hypothesis that the mean life of
this brand of tyre is
22,000 kilometres against the alternative hypothesis that this
figure is too high.
[5 marks]
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