Does jury size make a difference in decisions?  A researcher examined 110 cases decided by 12-person juries and 110 cases decided by 6-person juries.  Here are the results:       Acquittals Convictions Hung Juries 12-person jury   40 60 10 6-person jury   30 52 28   At α = .01, can we conclude that there is an effect of jury size on decisions? If so, explain to the TV reporter and audience what it is.

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A: Two prop Z test

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Q: The primary difference between an experimental and observational study is:

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.