The manufacturer of "Road King tyres claims that their tyres claim that their tyres last an average of 70,000 km or more. THE consumer board suspects that this claim may be false. And decided to test the manufacturer's claim. The Consumer Board took a sample of size 500 from the population. They ran the tyres untill they fail to meet the requirements for tread depth. The mean and standard deviation for the sample are respectively 69,914 and 2,131. What is the correct conclusion at a 1% significance level and test statistic of -. 90?

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A: Given that  Sample size n =21 Sample mean =115 Standard deviation=11

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A:

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A:

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A: Given: Sample size = 100 Sample standard deviation = 6 Sample mean = 160 Hypothesized mean = 158.2

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