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Calculate a z test to make a decision about a

Calculate a z test to make a decision about a sample.
Data: The average (mean) height for adult women is 65 inches, and the standard deviation is 3.5 inches. Given the women you know, you think this number is low. So, you record the heights of 25 of your female friends. The average height of your 25 friends is 66.84 inches.

Answer this question: If your friends are just a representative sample of adult females, what is the probability that your friends are so tall?

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