Compared to a correlation based on only a few cases, a sample based on many cases is _____.
a. easier to calculate c. a better description of the sample
b. less powerful d. all of these
Measurement is always approximate with a continuous variable.
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The number of cases measured and the power of r are _____ correlated.
a. positively c. not
b. negatively d. only partially
Most scales used for measuring psychological variables are either ratio or interval.
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The number of cases measured determines the _____ of the correlation statistic.
a. power c. N
b. degrees of freedom d. all of these
An ordinal scale possesses the attributes of magnitude and equal interval.
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If the dots on a scatter plot show no discernible pattern (i.e., they do not seem to cluster around any line or have any direction), then the correlation depicted by the graph is probably a _____ correlation.
a. perfect c. negative
b. positive d. nonsignificant or zero
If IQ was measured on a ratio scale, and John had an IQ of 40 and Fred an IQ of 80, it would be correct to say that Fred was twice as intelligent as John.
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If the dots on a scatter plot fall in a pattern from upper left to lower right, the variables are probably _____ correlated.
a. positively c. not
b. negatively d. falsely
With nominal scales there is a numerical relationship between the units of the scale.
Indicate whether the statement is true or false
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