Concept explainers
a.
Obtain a one-sided 95% confidence bound on the difference in the two proportions.
Explain whether there is a statistically significant difference in proportions of unlisted numbers between the two cities using confidence interval.
b.
Obtain a one-sided 90% confidence bound on the difference in the two proportions.
Explain whether there is a statistically significant difference in proportions of unlisted numbers between the two cities using confidence interval.
c.
Obtain a one-sided 95% confidence bound on the difference in the two proportions.
Obtain a one-sided 90% confidence bound on the difference in the two proportions.
Explain whether there is effect of increasing the sample size without changing the proportions on results or not.
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Applied Statistics and Probability for Engineers
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