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New tyres manufactured by a company inPerthare designed to provide a mean of at least80000 km.A consumer testing organisation company takes a sample of30 tyresand

New tyres manufactured by a company inPerthare designed to provide a mean of at least80000 km.A consumer testing organisation company takes a sample of30 tyresand determine that thesample meanwas78000 km, with a sample standard deviation of 4000 km.

Can we conclude, at a 5% significance level, that the new tyres last on average less than 80000 km?

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