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Hypothesis Test at 95% Confidence Level

An attorney claims that more than 20% of all lawyers in his city advertise. A sample of 200 lawyers in his city showed that 50 had used some form of advertising.

RQ: Do the lawyers advertise more than 20% in the attorney's city at a 95% confidence level?

A. Choose the Hypothesis
B. Specify the Decision Rule
C. Calculate the Test Statistic, P-value
D. Make the Decision
E. Give an interpretation of the Decision