Question: The U S Department of Transportation tracks and reports a wide
The U.S. Department of Transportation tracks and reports a wide variety of information regarding airlines and airports. It reports the “percent on-time” frequently. Compare the percent on-time arrival performance for the 31 major airports in the United States for the year to date through October 31, 2008, versus the year to date through October 31, 2009.
At the 0.05 level of significance, test the claim that there is no correlation between the 2008 year-to-date and the 2009 year-to-date percent on-time arrival performance at these airports.
Answer to relevant QuestionsOf the adult U.S. population, 36% has an allergy. A sample of 1200 randomly selected adults resulted in 33.2% having an allergy. a. Describe the population. b. What is the sample? c. Describe the variable. d. Identify the ...The November 24, 2009, USA Today article “Flier satisfaction with airlines goes up a bit” reported the results from a Zagat Survey of 5900 fliers who averaged 17 flights a year. The survey had fliers rate airlines using ...Refer to the bivariate data shown in the following table. a. Construct a scatter diagram. b. Calculate the Spearman rank correlation coefficient, rs [formula (14.11)]. c. Calculate Pearson’s correlation coefficient, r ...A candy company has developed two new chocolate- covered candy bars. Six randomly selected people all preferred candy bar I. Is this statistical evidence, at a = 0.05, that the general public will prefer candy bar I? A patient was given two different types of vitamin pills, one that contained iron and one that did not contain iron. The patient was instructed to take the pills on alternate days. To avoid having to remember which pill to ...
Post your question