Question: 8.11 The alcohol content of bottles of an imported brand of flavoured vodka is presumed to follow a Normal distribution with a standard deviation of

8.11 The alcohol content of bottles of an imported brand of flavoured vodka is presumed to follow a Normal distribution with a standard deviation of 0.83 per cent. The mean alcohol content of a random sample of 12 bottles is 64.6 per cent. Test the validity of the claim made by the importer that the average alcohol content is at least 65 per cent. Use a 5 per cent level of significance.

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