For a certain year a study reports that the percentage of college students using credit cards was 83%. A college dean of student services feels that this is too high for her university, so she randomly selects 50 students and finds that 40 of them use credit cards.   a- At a = 0.10, is she correct about her university? Calculate the value of the test statistic and state the alternatives, and conclusion. b- What would your conclusion be if the p-value of the test is equal to 0.0? c- Estimate the population proportion with 90% confidence

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