Question 1:
A researcher hypothesizes that people who listen to classical music have higher concentration skills than those in the general population. On a standard concentration test, the overall mean is 15.5. The researcher gave this same test to a random sample of 12 individuals who regularly listen to classical music. Their scores on the test were as follows:
16, 14, 20, 12, 25, 22, 23, 19, 17, 17, 21, 20
1. Is this a one- or two-tailed test?
2. Conduct all 6 steps of the appropriate statistic. Be sure to label all six steps.
3. Calculate and interpret the effect size for this test.
Question 2:
At some vacation destinations, "all-inclusive" resorts allow you to pay a flat rate and then eat and drink as much as you want. There has been concern about whether these deals might lead to excessive consumption of alcohol by young adults on spring break trips. You decide to spend your spring break collecting data on this issue. Of course, you need to take all of our friends on this funded research trip, because you need a lot of research assistants! You collect data on the number of drinks consumed in a day by people staying at all-inclusive resorts and by those staying at non-inclusive resorts. Your data include the following:
All-inclusive resort guests: 10, 8, 13
Non-inclusive resort guests: 3, 15, 7
1. Conduct all 6 steps of an independent-samples t test. Be sure to label all six steps.
2. Report the statistics as you would in a journal article.
Question 3:
You wish to compare how a low-fat diet, low-fat diet and a brisk four-mile walk each day, and a low-fat diet and a four-mile job each day affect cholesterol levels. You randomly assign six subjects to each group. The scores in the table below show the reduction in cholesterol count after two months.
1. Conduct all 6 steps of the appropriate statistic. Be sure to label all six steps.
2. Calculate and interpret the effect size for this test.
3. Calculate and interpret any post-hoc test if necessary.