A tire manufacturer claims that its tires have a mean life of at least 50 000 km

Question

A tire manufacturer claims that its tires have a mean life of at least 50 000 km. A random sample of 16 of these tires is tested and the sample mean is 33 000 kms. Assume the population's standard deviation is 3000 kms and the lives of tires are approximately normally distributed. To test the manufacturer's claim using the 5% level of significance th analyst should O use a two tail test and the test statistic t use a one tail test in the left tail and the test statistic t use a one tail test in the left tail and the test statistic Z use a one tail test in the right tail and the test statistic Z

Explanation / Answer

we will use one tail test in the right tail and test statistics z Z statistics has been used because we taking population standar deviation which is known And right tail bacause P(X>50000km) has been asked.

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