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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?
A pair of dice is tossed once. Let X denote the sum of the face values, and let Y denote the absolute value of the difference between the face values.
Construct a 95% confidence interval for the proportion of votes that Jefferson will receive, and make a conclusion about Jefferson winning election.
What is the explained return on an equally weighted portfolio of these three stocks? What is the variance of a portfolio invested 20 percent each in A and B and 40 percent in C?
A personality psychologist conducts a study to examine the relationship between extraversion and the number of siblings in a household.
What is the probability that none can transact business in a foreign language?
Which of the following is true regarding ANOVA? a) It is used to test for a difference in medians among three or more populations
A summary of data (deposits in thousands of dollars) from the survey is as follows: First National 1 = 4.1, σ1 = 1.2; City National 2 = 3.5, σ2 = 0.9. Use a 98% confidence interval to estimate the difference in the mean weekly deposits into IRAs f..
Based on a simple random sample of one hundred an analyst estimates the average hourly wage earned by workers in a city to be $30 and computes the margin of error to be $5.
Would you play this game if you wanted to make money? What do we expert the value of the results of the game to be?
Determine probability that student was sophomore? Determine the probability of selecting a face card from deck of 52 cards.
Significance level to test the claim that less than half (.5) of all executives identify that error as being the most common job interviewing error.
Based on p=.60, probability that a randomly selected homeowners will say no to newspaper subscription.
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