The data for this problem are courtesy of David Jarjoura of OSU. Consider an experiment in which 24 animals are randomly assigned to 4 different diets. At the conclusion of the study, the coagulation time (in seconds) for blood drawn from the animals was recorded. The results of the oneway ANOVA are shown below to compare the mean coagulation time by diet.  

Why is it best to treat this as paired data? 

Match the following variables.

How does the interaction plot confirm your answer to the previous problem?

16 patients with oral cancer are acquired.  It is desired to compare the size of the tumors relative to the location in the mouth.  Group A has 9 patients with the tumor on the tongue and Group B has 7 patients with the tumor in the cheek.  If we want to compare the tumor sizes (diameter length in mm) relative to the location in the mouth, which test would be most appropriate? There is a clear outlier in the data indicating that a nonparametric procedure is desired. (Note: we know nothing about the patients beyond the location of the tumor).

Use the following for the next 3 questions. I drink a lot of soft drinks so I want to test if soft drinks increase tooth probe depth to dangerous levels. According to the all-knowing ‘Wikipedia’, a tooth probe depth of more than 4mm is considered moderate periodontal disease.  I collect a sample of 49 people who drink a lot of soft drinks, and find them to have an average tooth pocket depth of 4.2mm and a sample standard deviation of 1mm. 

Are the differences in mean temperature for the nine medications the same for the three severities (i.e., is there NO significant interaction at the 0.05 significance level)?

The War in Afghanistan began _________________but, ______________________

A local health authority has expressed concern that general health practitioners are prepared to work for the government health service on qualification, but choose private practice once they have gained some professional experience. If this were to be the case then dentists in private practice would on average have longer experience than dentists working for the government health service.  For a town within this health authority, the 9 dentists working for the government health service and 11 dentists in private practice were asked how many years they had been in practice since qualification. None of the dentists carried out both health service and private practice work.     What is the appropriate analysis?

Which of the following statements regarding the Iran-Contra Affair are true?