Homework Chapter 10
Assignment:
Objective: Review concept Correlation and Causation
- The two major requirements for causal conclusions from an experimental design are ______________.
Objective: Apply concepts Correlation, Causation
- If a strong positive correlation between the viewing of violent films and antisocial behaviour were observed, many might assume that viewing violent films causes antisocial behaviour. This would be a faulty assumption because ______________.
Objective: Apply technique Correlation
- A researcher seeks to replicate a study that found a significant positive relationship between women’s symptoms of obsessive-compulsive disorder and their core beliefs regarding the importance of holding unrelenting standards. The data collected are shown below. Using a scatter plot, examine the strength and direction of the relationship between the two variables. The relationship appears to be ______________.
| Client | OCD (X) | Beliefs (Y) |
| 1 | 4.08 | 7.20 |
| 2 | 4.43 | 3.69 |
| 3 | 6.56 | 7.27 |
| 4 | 1.72 | 3.62 |
| 5 | 3.79 | 2.83 |
| 6 | 1.51 | 4.71 |
| 7 | 4.32 | 0.64 |
| 8 | 6.16 | 7.62 |
| 9 | 5.65 | 0.22 |
| 10 | 2.61 | 5.08 |
| 11 | 3.97 | 0.42 |
| 12 | 2.79 | 3.36 |
| 13 | 1.36 | 1.61 |
| 14 | 1.71 | 3.15 |
| 15 | 3.10 | 3.25 |
| 16 | 3.26 | 4.45 |
| 17 | 3.40 | 4.11 |
| 18 | 0.81 | 4.32 |
| 19 | 1.63 | 0.20 |
| 20 | 4.03 | 1.98 |
| 21 | 3.24 | 5.16 |
| 22 | 2.00 | 6.67 |
| 23 | 3.92 | 0.82 |
| 24 | 7.03 | 3.09 |
| 25 | 0.95 | 0.52 |
| 26 | 0.29 | 3.14 |
- For the research scenario described in problem 3, for a hypothesis test on correlation, assume the Populations are defined as follows. Population 1: Women like those in this study; Population 2: Women for whom there is no (positive) relationship between the two variables. The hypotheses should be defined as ______________.
- For the research scenario described in problem 3, the characteristics of the comparison distribution should be defined as ______________.
- For the research scenario described in problem 3, assuming a significance level of .01, the cutoff t score should be ______________.
- For the research scenario described in problem 3, the calculated t-test result should be ______________.
- For the research scenario described in problem 3, the hypothesis test decision should be ______________.
- For the research scenario described in problem 3, the p-value associated with the t-test result is _____________.
- For the research scenario described in problem 3, the conclusion as written in a published results section could be ______________.
Objective: Apply technique Regression
- For the research scenario described in problem 3, the slope of the best fit regression line would be ______________.
- For the research scenario described in problem 3, the intercept of the best fit regression line would be ______________.
Objective: Apply concepts Prediction
- For the research scenario described in problem 3, the predicted core beliefs score for a woman with the OCD symptom score of 3.70 would be ______________.
- The accuracy of predictions made from the regression model from the data in the research scenario described in problem 3 would be ______________.
