Psychology Chapter 9 Assignment Answers
Chapter 9 Assignment
Address the 16 questions below regarding Chapter 9
A medical clinician wants to determine what dosage level of a new pain drug would be most effective. He randomly selects participants from several pain clinic. He then randomly assigns participants to one of 3 group. He pretest all participants for 2 weeks having them to report their level of pain on a scale of 1 to 10. Afterwards, the Control group receives a moderate level of the drug, Experimental group A receives a low dosage of the drug, and Experimental group B receives a high dose of the drug. Participants are asked to use the drug for 2 weeks and report their level of pain for the posttest scores. The medical researcher attempts to control for confounds. Below are dependent variable pain scores.
Dosage
Low Mod High 7 5 3 8 8 2 6 4 1Answer the questions regarding the above study.
- What is the Independent Variable?
- What is the Dependent Variable?
- What is the operational definitions for the Independent Variable and the Dependent Variable?
- Why is this an experimental design (refer back to true experiment in chapter 9).
- What type of between-subjects design is this?
- Why would you use an single factor (one-way) ANOVA as the statistical test of choice (opposed to a t-test?
- What are degrees of freedom?
ANOVA TABLE
Sum of Squares |
df |
Mean Square |
F |
Significance |
|
Between Groups Within Groups Total |
40.222 12.667 52.889 |
- What is the F value?
- What is the value total degrees of freedom?
- What is the value of between-groups degrees of freedom?
- What is the value of within-groups degrees of freedom?
- What is the value of between groups mean square?
- What is the value within-groups mean square?
- What is the significance level (you must use your book for this page 423 and 424)?
- Are the results significant (you must complete the ANOVA table)?
- If significant, do you need to do further testing? Why or Why not?