According to Pew Research Center surveys, 79% of U.S. adults were using the Internet in January 2011
Question:
a. Let p1 and p2 be the proportions of all U.S. adults who were using the Internet in January 2011 and January 2012, respectively. Construct a 98% confidence interval for p1 – p2.
b. Using a 1% significance level, can you conclude that p1 is lower than p2? Use both the critical-value and the p-value approaches.
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