Question: A maker of toothpaste is doing quality control tests on the amount of toothpaste in the tubes. Thirty tubes of toothpaste are randomly selected, and

A maker of toothpaste is doing quality control tests on the amount of toothpaste in the tubes. Thirty tubes of toothpaste are randomly selected, and the quantity of toothpaste in each tube is precisely measured, in millilitres. Construct a 95% confidence interval for the average amount of toothpaste in the tubes.

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