Question 2 of 2 -/15 View Policies Current Attempt in Progress Arandom sample of 1500 residential telephones in Phoenix found that 380 of the numbers were unlisted. A random sample in the same year of 1200 telephones in Scottsdale found that 315 were unlisted. Round your answers to four decimal places (e.g.98.7654). (a) Calculate a 95% two-sided confidence interval on the difference in the proportions of unlisted numbers between the two cities. Sp1-p2s (b) Is there a significant difference between the two proportions at a = 0.05? (c) Calculate a 90% two-sided confidence interval on the difference in the proportions of unlisted numbers between the two cities. Sp1-p2s Statistical Tables and Charts e Textbook and Media Save for Later Attempts: 0 of 3 used Submit Answer
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