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Question: Airline mergers cause many problems for the airline industry. One variable often quoted as a measure of an airline's efficiency is the percentage of on-time departures. Following the merger of Republic Airlines with Northwest Airlines, the percentage of on-time departures for Northwest planes declined from approximately 85% to about 68%. Suppose that the percentages reported above are based on two random samples of flights: a sample of 100 flights over a period of two months before the merger, of which 85 are found to have departed on time; and a sample of 100 flights over a period of two months after the merger, 68 of which are found to have departed on time. Based on these data, do you believe that Northwest's on-time percentage declined during the period following its merger with Republic?
Test the hypothesis that the machines are showing difference qualities of performance. Use 5 per cent level of significance.
at a certain university the average attendance at basketball games has been 2825. this year the attendance for the
Estimate the probability that the machine will overflow an 8 oz cup.
Based on the analysis of variance, is there a difference in the average number of ounces filled by the four machines? Apply Tukey's HSD test to compare the mean differences if the overall ANOVA test is significant at the 5% level.
Discuss examples where you would use test of hypothesis at your personal or professional life, in your education or society for the following situations:
Suppose that you select a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
Suppose a simple random sample of size 42 is selected from a population with = 10. Find the value of the standard error of the mean in each of the following cases.
Analyzing images. We are bombarded with visual images nearly as much as we're inundated with verbal information. We carry images on our PDA devices, on our computers, on Facebook and other network pages.
Plot the sales data as a time series and do you think this series is stationary or nonstationary
Problem: Land in Canada. Canada's national statistics agency, Statistics Canada, says that the land area of Canada is 9,094,000 square kilometers. Of this land, 4,176,000 square kilometers are forested. Choose a square kilometer of land in Canada ..
Translate the following statements into symbolic form using capital letters to represent affirmative English statements.- Either Mariah Carey sings pop and Elton John sings rock or Diana Krall sings jazz.
The theory of constraints
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