Pearson Correlations-Statistics

 

 

  1. What information is provided by the sign (+ or -) of the Pearson correlation?

 

  1. What information is provided by the numerical value of the Pearson correlation?

 

  1. Which of the following is the correct order, from strongest and most consistent to weakest and least consistent, for the following correlations?

 

  1. -1.00, 0.85, -.043, 0.02
  2. 85, 0.02, -0.43, -1.00
  3. -1.00, -0.43, 0.02, 0.85
  4. 85, -.43,0.02, -1.00

 

  1. What is measured by a partial correlation?
    1. It is the correlation obtained for a sample with missing sores (X or Y values).
    2. It is the correlation obtained for a restricted range of scores.
    3. It eliminates the influence of outliers (extreme scores) when computing a correlation.
    4. It measures the relationship between two variables while controlling the influence of a third variable.

 

  1. For a hypothesis test for the Pearson correlation, what is stated by the null hypothesis?
    1. There is a non-zero correlation for the general population.
    2. The population correlation is zero
    3. There is a non-zero correlation for the sample
    4. The sample correlation is zero.

 

  1. 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

 

  1. 5
  2. 6
  3. 7
  4. 8

 

  1. In what situation can the phi-coefficient be used?
    1. When an independent-measures t test would also be appropriate.
    2. When both X and Y are ranks.
    3. When a single-sample t test would also be appropriate.
    4. When both X and Y are dichotomous

 

  1. For the following scores,

 

X Y
2 7
5 4
4 7
7 5
2 6
4 7

 

  1. Sketch a scatter plot showing the six data points
  2. Just looking at the scatter plot, estimate the value of the Pearson correlation

 

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