Questions from Statistical Techniques

Q: After a losing season, there is a great uproar to fire

After a losing season, there is a great uproar to fire the head football coach. In a random sample of 200 college alumni, 80 favor keeping the coach. Test at the .05 level of significance whether th...

Q: Compute a simple index for the revenue of GE using the period

Compute a simple index for the revenue of GE using the period 2004–06 as the base. What can you conclude about the change in revenue over the period? Use the following information from Genera...

Q: The following sample data were obtained from three populations where the variances

The following sample data were obtained from three populations where the variances were not equal, and you wish to compare the populations. a. State the null hypothesis. b. Using the .01 l...

Q: Listed below is the annual rate of return (reported in percent

Listed below is the annual rate of return (reported in percent) for a sample of 12 taxable mutual funds. Using the .05 significance level, is it reasonable to conclude that the mean rate of...

Q: Each month the National Association of Purchasing Managers surveys purchasing managers and

Each month the National Association of Purchasing Managers surveys purchasing managers and publishes the NAPM index. One of the questions asked on the survey is: Do you think the economy is contract...

Q: For a recent year, the mean fare to fly from Charlotte

For a recent year, the mean fare to fly from Charlotte, North Carolina, to Chicago, Illinois, on a discount ticket was $267. A random sample of 13 round-trip discount fares on this route last month...

Q: There are two major cell phone providers in the Colorado Springs,

There are two major cell phone providers in the Colorado Springs, Colorado area, one called HTC and the other, Mountain Communications. We want to investigate the “churn rate” for each p...

Q: A United Nations report shows the mean family income for Mexican migrants

A United Nations report shows the mean family income for Mexican migrants to the United States is $27,000 per year. A FLOC (Farm Labor Organizing Committee) evaluation of 25 Mexican family units rev...

Q: A study was conducted to determine if there was a difference in

A study was conducted to determine if there was a difference in the humor content in British and American trade magazine advertisements. In an independent random sample of 270 American trade magazin...

Q: The American Water Works Association reports that the per capita water use

The American Water Works Association reports that the per capita water use in a single-family home is 69 gallons per day. Legacy Ranch is a relatively new housing development. The builders installed...