Homework Chapter 10

Assignment:

Objective: Review concept Correlation and Causation

  1. The two major requirements for causal conclusions from an experimental design are ______________.

Objective: Apply concepts Correlation, Causation

  1. 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

  1. 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
  1. 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 ______________.
  2. For the research scenario described in problem 3, the characteristics of the comparison distribution should be defined as ______________.
  3. For the research scenario described in problem 3, assuming a significance level of .01, the cutoff t score should be ______________.
  4. For the research scenario described in problem 3, the calculated t-test result should be ______________.
  5. For the research scenario described in problem 3, the hypothesis test decision should be ______________.
  6. For the research scenario described in problem 3, the p-value associated with the t-test result is _____________.
  7. For the research scenario described in problem 3, the conclusion as written in a published results section could be ______________.

Objective: Apply technique Regression

  1. For the research scenario described in problem 3, the slope of the best fit regression line would be ______________.
  2. For the research scenario described in problem 3, the intercept of the best fit regression line would be ______________.

Objective: Apply concepts Prediction

  1. 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 ______________.
  2. The accuracy of predictions made from the regression model from the data in the research scenario described in problem 3 would be ______________.

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Beginner Statistics for Psychology Copyright © 2021 by Nicole Vittoz is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted.