Question: Explain why it is necessary to check whether the population is approximately normal before constructing a confidence interval. Let's shake on it: A random sample

Explain why it is necessary to check whether the population is approximately normal before constructing a confidence interval.

Let's shake on it: A random sample of 12-ounce milkshakes from 12 fast-food restaurants had the following number of calories. 450 399 591 504 510 613 A476 700 473 375 472 642 ( Send data to Excel ) Assume the population standard deviation is a = 93

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