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Statistics: Calculating the test statistic z

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Hi, I need assistance finding the value of the test statistic z using the below model:

z = p - p / square root pq/n

Question: The claim is that more than 75% of adults always wear a seat belt in the front seat. A Harris poll of 1012 adults resulted in 870 who say that they always wear a seat belt in the front seat.

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Solution Summary

This solution provides assistance in finding the value of the test statistic Z.

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