Question: The sample mean is x = 3.75 grams. Let x be a random variable representing weights of hummingbirds in this part of the Grand Canyon.

The sample mean isx= 3.75 grams. Letxbe a random variable representing weights of hummingbirds in this part of the Grand Canyon. We assume thatxhas a normal distribution and=0.90gram.Suppose it is known that for the population of all Anna's hummingbirds, the mean weight is=4.75grams.

Compute thezvalue of the sample test statistic

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