Purchase Solution

Sample size estimation and Confidence Interval

Not what you're looking for?

Ask Custom Question

The U.S. Department of Transportation defines an airline flight as being "on-time" if it landed less than 15 minutes after the scheduled time shown in the carrier's Computerized Reservation System. Cancelled and diverted flights are counted as late. A study of the 10 largest U.S. domestic airlines found Southwest Airlines to have the lowest proportion of late arrivals, 0.1577 (Nikos Tsikriktsis and Janelle Heineke, "The Impact of Process Variation on Customer Dissatisfaction: Evidence from the U.S. Domestic Airline Industry," Decision Sciences, Winter 2004, 35(1): 129-142). Suppose you were asked to perform a follow-up study for Southwest Airlines in order to update the estimated proportion of late arrivals. What sample size would you use in order to estimate the population proportion to within an error of
a. ±0.06 with 95% confidence?
b. ±0.04 with 95% confidence?
c. ±0.02 with 95% confidence?

Purchase this Solution

Solution Summary

Estimation of sample size and confidence interval of population proportion with step by step procedure and formula is given in the solution.

Purchase this Solution


Free BrainMass Quizzes
Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.