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Multiple Choice Quiz I
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1

When data analysis is completed, the researcher should prepare
A)figures to go with the data.
B)a coherent analysis story.
C)data summaries.
D)computer checks.
2

When constructing a stem-and-leaf display, the leading digits of each number in a data set become
A)branches.
B)leaves.
C)stems.
D)frequencies.
3

If one score in a distribution changes in value then we can be confident that the ___________also changes.
A)mode
B)mean
C)range
D)median
4

The _____tells us approximately how far scores vary from the mean on the average.
A)variance
B)range
C)standard deviation
D)sum of squared deviations
5

Dividing the population standard deviation by the square root of the sample size yields the
A)population range.
B)standard error of the mean.
C)estimated standard error.
D)point estimate of the variance.
6

Effect size measures are generally independent of
A)the effect of the independent variable.
B)sample size.
C)sample variability.
D)the sample standard deviation.
7

To help interpret the effect size measure, d, the statistician J. Cohen classified effect sizes as small, medium, and large. According to Cohen, a medium effect size corresponds to a d ratio of
A).30.
B).80.
C).50.
D)1.00.
8

The confidence interval for a population mean is centered around
A)the true population mean.
B)the standard error of the mean.
C)the sample mean.
D)the estimated standard error.
9

When interpreting confidence intervals for a difference between two means, if zero is in the interval we will want to conclude that
A)the population means are different.
B)there is definitely no difference between the population means.
C)we are uncertain about the direction of an effect.
D)the interval is incorrectly calculated.
10

If a correlation coefficient is close to 0.0, we know that
A)the scatterplot resembles a straight line.
B)the scatterplot shows a curvilinear relationship.
C)our ability to make predictions for the variables is poor.
D)we can predict confidently for these variables.





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