Question

From a past research, It has been found that the average mileage driven by a certain car before the first tyre replacement is 20,000 km. A researcher believe it is greater than this value. He randomly take 25 cars and mean and standard deviation were measured as 21.653 and 4920 respectively, What is the test statistic value to test this hypothesis ?
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Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

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