Pearson Correlations-Statistics
- What information is provided by the sign (+ or -) of the Pearson correlation?
- What information is provided by the numerical value of the Pearson correlation?
- Which of the following is the correct order, from strongest and most consistent to weakest and least consistent, for the following correlations?
- -1.00, 0.85, -.043, 0.02
- 85, 0.02, -0.43, -1.00
- -1.00, -0.43, 0.02, 0.85
- 85, -.43,0.02, -1.00
- What is measured by a partial correlation?
- It is the correlation obtained for a sample with missing sores (X or Y values).
- It is the correlation obtained for a restricted range of scores.
- It eliminates the influence of outliers (extreme scores) when computing a correlation.
- It measures the relationship between two variables while controlling the influence of a third variable.
- For a hypothesis test for the Pearson correlation, what is stated by the null hypothesis?
- There is a non-zero correlation for the general population.
- The population correlation is zero
- There is a non-zero correlation for the sample
- The sample correlation is zero.
- If the following scores are ranked, what rank is assigned to an individual with a score of X=7
Scores: 1, 2, 2, 5, 6, 6, 6, 7, 10, 12
- 5
- 6
- 7
- 8
- In what situation can the phi-coefficient be used?
- When an independent-measures t test would also be appropriate.
- When both X and Y are ranks.
- When a single-sample t test would also be appropriate.
- When both X and Y are dichotomous
- For the following scores,
X |
Y |
2 |
7 |
5 |
4 |
4 |
7 |
7 |
5 |
2 |
6 |
4 |
7 |
- Sketch a scatter plot showing the six data points
- Just looking at the scatter plot, estimate the value of the Pearson correlation
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