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yawa3891 [41]
3 years ago
6

A random sample of 1500 residential telephones in Phoenix found that 394 of the numbers were unlisted. A random sample in the sa

me year of 1200 telephones in Scottsdale found that 313 were unlisted.
A. Find a 95% confidence interval on the difference in the two proportions and use this confidence interval to determine 2010 whether there is a statistically significant difference in proportions of unlisted numbers between the two cities.
B. Find a 90% confidence interval on the difference in the two proportions and use this confidence interval to determine 2010 whether there is a statistically significant difference in proportions of unlisted numbers for the two cities.
Mathematics
1 answer:
ololo11 [35]3 years ago
6 0

Answer:

3089

Step-by-step explanation:

3089

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<h3>What is the Radius of a Circle?</h3>

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