Question

A scientific supply company has developed a new breed of lab rat, which it claims weighs the same as the classic white rat. The population mean (and standard deviation) for the classic white rat is 485 grams (20 grams). A researcher obtained a sample of 76 of the new breed of rats, weighed them, and found M = 500 grams. What test should he do to see if the company’s claim is true?

Answer 1

Here we have given population mean and population standard deviation .

We know that when population standard deviation is known then we use Z test for hypothesis testing.

Hence

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