A November 2011 Gallup poll asked American adults about their views of healthcare and the healthcare system
Question:
a. Let p1 and p2 be the proportions of all Independents and all Democrats, respectively, who will rate the healthcare system as being excellent or good. Construct a 97% confidence interval for p1 – p2.
b. Using a 1% significance level, can you conclude that p1 is different from p2? Use both the critical-value and the p-value approaches.
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