IHP 525 Quiz Four
Answer the following questions covering materials from
previous chapters in your textbook. Each question is worth 7 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) |
0.95 |
1.48 |
1.33 |
1.28 |
||
|
Group 2 (ibuprofen) |
0.39 |
0.44 |
1.31 |
2.48 |
1.39 |
|
|
Group 3 (acetaminophen) |
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)?
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