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Multiple Choice Quiz II
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1

Perhaps the best way to get a feel for a data set is to
A)draw a graph of the data.
B)find the mean.
C)perform a statistical test.
D)calculate the range.
2

Which of the following is not a measure of central tendency?
A)mean
B)mode
C)range
D)median
3

The score appearing most frequently in a distribution is equal to the
A)mean.
B)mode.
C)median.
D)standard deviation.
4

A measure of effect size that is appropriate when we are comparing two means is
A)Cohen's f.
B)Cohen's beta
C)Cohen's d.
D)Cohen's z.
5

The smaller the range of values defining a confidence interval, the
A)greater the error in estimation.
B)smaller the estimate of the population value.
C)better our estimate of the population value.
D)less accuracy in estimation.
6

When interpreting confidence intervals when there are three or more means, if two or more intervals do not overlap, we may conclude that
A)the population means do not differ.
B)the sample means differ.
C)the true population mean difference is zero.
D)the population means differ.
7

A correlation exists when two different measures of the sample people, events, or things
A)are unrelated.
B)vary independently.
C)are the same.
D)vary together.
8

The magnitude or degree of a correlation will increase as points in a scatterplot
A)fall on top of one another.
B)are spread out.
C)correspond to a straight line.
D)correspond to the x- and y-axis.
9

A scatterplot that appears to have no shape or reveals no trend whatsoever is associated with a correlation coefficient of
A)+ 1.00.
B).50.
C)0.0.
D)either -.50 or +.50.
10

A major reason why we may not make causal conclusions based only on correlational evidence is that a correlation between two variables
A)is likely to be in error.
B)is never about variables that are causally related.
C)may be due to a third variable.
D)cannot be calculated for causally related variables.





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