IHP 525 Quiz Four-A trial evaluated the fever-inducing effects

IHP 525 Quiz Four
Answer the following questions covering materials from previous chapters in your textbook.
Each question is worth 2.5 points.
1. A trial evaluated the fever-inducing effects of three substances. Study subjects were
adults seen in an emergency room with diagnoses of the flu and body temperatures
between 100.0 and 100.9ºF. The three treatments (aspirin, ibuprofen and
acetaminophen) were assigned randomly to study subjects. Body temperatures were
reevaluated 2 hours after administration of treatments. The below table lists the data.
Table: Decreases in body temperature (degrees Fahrenheit)
Group 1 (aspirin)
Group 2
(ibuprofen)
Group 3
(acetaminophen) 0.95
0.39 1.48
0.44 1.33
1.31 1.28
2.48 1.39 0.19 1.02 0.07 0.01 0.62 -0.39 Complete an ANOVA for the above. What do you conclude?
2. Evidence of nonrandom differences in group means occurs when the variance between
groups is __________ the variance within groups.
3. Why are scatterplots necessary when investigating the relationship between quantitative
variables?
4. r is always greater than or equal to _____ and less than or equal to _____. Perfect
negative association is present when r = _____. Perfect positive association is present
when r = _____. Between r = -0.56 and r = +0.46, the stronger correlation is _____.
5. Besides linearity, what conditions are needed to infer population slope ? (3 more
conditions)? Besides linearity, what conditions are needed to infer population
correlation coefficient ? (2 more conditions)?