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A random sample of 1500 residential telephones in Phoenix found that 390 of the numbers were...

Question:

A random sample of 1500 residential telephones in Phoenix found that 390 of the numbers were unlisted. A random sample in the

A random sample of 1500 residential telephones in Phoenix found that 390 of the numbers were unlisted. A random sample in the same year of 1200 telephones in Scottsdale found that 304 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. -0.0336 sp1-p2s 0.0329 (b) Is there a significant difference between the two proportions at a = 0.05? No. (c) Calculate a 90% two-sided confidence interval on the difference in the proportions of unlisted numbers between the two cities. sp1-p2s 0.0275 Statistical Tables and Charts -0.0282

Answers

MINITAB procedure: Step 1: Choose Stat > Basic Statistics > 2 Proportions. Step 2: Choose Summarized data. Step 3: In First sThe 95% confidence interval is -0.0265 P.-P. 30.0398. (b) No.</p><p>(c) MINITAB procedure: Step 1: Choose Stat > Basic Statistics >Test and CI for Two Proportions Sample 1 2 N Sample p 390 1500 0.260000 304 1200 0.253333 Difference - P(1) - D (2) Estimate

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