1
Correlation practice
8 people are measured on the following variables:
years of education intelligence
10 20
11 25
8 15
12 22
10 18
9 20
12 26
9 21
a. calculate Pearson's r
b. describe what this means using variance.
c. Show whether this correlation is likely the result of a true relationship between education and
intelligence.
The correlation between religious commitment and how much people approve of divorce is -.56. Describe what the sign of this correlation means. Describe the coefficient magnitude in terms of variance. Draw the Venn Diagram.
3. The correlation between amount of driving time and number of accidents is .68. Explain this using variance.
Answers
r = .80
64% of the differences in years of education overlap with differences in intelligence.
p = .017 (1.7%), reject the null hypothesis. Yes, this relationship is probably real.
31.36% of the differences in how much people approve of divorce can be predicted by differences in religious commitment
The higher the religious commitment, on average, the lower the approval of divorce.
46.24% of the differences in number of accidents can be explained by differences in driving time.
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