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Multiple Choice Quiz
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1
If you wish to correlate two sets of nominal data, which of the following measures would be the most appropriate?
A)Cramer's V Statistic
B)Pearson's product moment correlation
C)Cochran's Q
D)Spearman's rho
2
Suppose you calculate a correlation between age of head of household and household income. You find an r of .55. Approximately what percent of income is "explained" by age?
A)About 74%
B)About 55%
C)About 30%
D)Unknowable from information given
3
Which of the following is NOT a measure of association used with nominal data?
A)Contingency coefficient
B)Cramer's statistic
C)Lambda
D)Kendall Tau
4
The Pearson's correlation coefficient:
A)Varies between 0 and 1.
B)Is negative if the variables are inversely related.
C)Implies an absence of a relationship if it is near 0.
D)Can be very high, and yet there may be no causal relationship between the variables.
E)All of the above.
5
A scatterplot of infinite observations of two continuous variables with a coefficient of correlation r = 1, will be:
A)Vertical, through a point in the x-axis.
B)A positively sloping straight line.
C)A downward sloping straight line.
D)A cloud of points stretched from the lower left corner to the upper right corner.
E)A cloud of points stretched from the upper left corner to the lower right corner.
F)None of the above.
6
A demand study using the technique of linear regression, relating the demand (DX) for commodity X to the price (Py) of commodity Y finds: DX = 200 + 4Py This implies:
A)Demand for X increases when the price of Y falls.
B)Demand for X decreases when the price of Y decreases.
C)When the price of Y is zero, the demand for X is 200 units.
D)A and C are both correct.
E)B and C are both correct.
7
Which measure of correlation would you use for the following type of data. Two panels of judges rank the quality of 15 different wines. We wish to study the correlation in the judgments of the two panels.
A)Pearson's r
B)Cramer's V
C)Rho
D)Phi
8
In examining a scatterplot of a correlation with a positive coefficient, which of the following are we least likely to find?
A)A cloud of points in the shape of a ball.
B)A wide band of points trending from upper right to lower left.
C)A narrow band of points from upper right to lower left.
D)A curvilinear patterm.
9
Correlation between two variables shows:
A)that if one variable increases over time the other will also increase.
B)that there is a causal relationship between the two variables.
C)the degree to which variations in one variable explain the variation of the second variable.
D)A and B are correct.
E)B and C are correct.
F)A and C are correct.





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