Linear correlation/Introductory quiz

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10-item correlation quiz

Please take this introductory quiz.
If you achieve 8/10 or higher, you probably don't need to study this topic!

1. Correlation is a __________ type of statistical analysis.

univariate
bivariate
multivariate

2. Correlation is:

the covariance of standardised scores
the mean of the population standard deviations
a way of testing cause and effect
for comparing mean differences
none of the above

3. Estimate the correlation between the number of guns in a community and the number of firearm deaths:

moderate to large positive
small positive
zero or near zero
small negative
moderate to large negative

4. Estimate the correlation between robberies and incidence of drug abuse:

moderate to large positive
small positive
zero or near zero
small negative
moderate to large negative

5. Estimate the correlation between rate of condom use and incidence of AIDS:

large positive
small to moderately positive
zero or near zero
small to moderately negative
large negative

6. Estimate the correlation between community education level and crime rate:

moderate to large positive
small positive
zero or near zero
small negative
moderate to large negative

7. Estimate the correlation between solar flares and suicide:

moderate to large positive
small positive
zero or near zero
small negative
moderate to large negative

8. The degrees of freedom for Pearson’s product-moment r = \frac {\sum z_x z_y}{n - ?}.is equal to:

0
1
2
7

9. Which of the following checks are not relevant to deciding whether the Pearson product-moment correlation is an appropriate indication of the degree of linear association between two variables?

Check the scatterplot for outliers
Each variable is normally distributed
The data represent a sample, not a population
Check the scatterplot for linearity

10. The square of the correlation coefficient or r2 is called the

coefficient of determination
variance
covariance
coefficient of discontent
Big R

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