Question

A popular Two-Wheeler's company claims that its best-selling model averages 18 km per litre of petrol. But recently a government agency used a sample of 80 two-wheelers of this model and finds the sample mean to be 16.8 km/litre. We also know from previous studies that the population standard deviation is 3 km/litre. Can we expect (within 2 standard errors) that we could select such a sample if indeed the population mean is 18 km/litre?

Answer 1

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Here P Value < a hence we reject Ho. Conclusion : Hence we CAN NOT expect (within 2 standard errors) that we could select such a sample if indeed the population mean is 18