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Four randomly sampled 500mL bottles of Guiness Original beer was measured for its alcohol content. The sampole mean was 21.3mL and the sample standard deviation

Four randomly sampled 500mL bottles of Guiness Original beer was measured for its alcohol content. The sampole mean was 21.3mL and the sample standard deviation was 0.7mL. Assuming that the alcohol content is a normally distributed random variable, construct a 95% confidence interval for the mean alcohol content of all bottles.

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