8.35 Murders and poverty, Part II. Exercise 8.25 presents regression output from a model for predicting annual murders per million from percentage living in poverty based on a random sample of 20 metropolitan areas. The model output is also provided below. Estimate Std. Error t value Pr(>|t|) (Intercept) poverty% -29.901 7.789 -3.839 0.001 2.559 0.390 6.562 0.000 s = 5.512 R? = 70.52% Radj = 68.89% (a) What are the hypotheses for evaluating whether poverty percentage is a significant predictor of murder rate? (b) State the conclusion of the hypothesis test from part (a) in context of the data. (c) Calculate a 95% confidence interval for the slope of poverty percentage, and interpret it in context of the data.

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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.