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Multiple Choice Quiz
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1

An operational definition of a variable that is being studied must have _________ levels.
A)one to two
B)two to three
C)two or more
D)three or more
2

Most independent variables are __________ scale.
A)nominal
B)ordinal
C)interval
D)ratio
3

Which of the scales of measurement is quantitative but the intervals are not equal?
A)nominal
B)ordinal
C)interval
D)ratio
4

A researcher can see the __________ of a distribution by looking at a frequency distribution.
A)slices
B)mean
C)variance
D)shape.
5

A frequency __________ uses a line to represent the frequency.
A)bar graph
B)scatterplot
C)polygon
D)distribution
6

The _________ should be used when scores are measured on an ordinal scale.
A)mean
B)median
C)mode
D)a or b
7

When there are a few unusual or extreme scores, it is best to use the _______ or the ______ as an indicator of central tendency.
A)mean; median
B)median; mode
C)mean; mode
D)mean; sample size
8

The __________ indicates the average deviation of scores from the mean.
A)standard deviation
B)range
C)variance.
D)deviation
9

A Pearson r correlation coefficient describes the __________ and the _________ of a linear relationship between two interval scale or ratio scale variables.
A)level; amount
B)similarity; importance
C)direction; strength
D)variability; significance
10

In a study examining the relationship between participant's age and number of friends, a Pearson r = -.62 was computed. Which of the following best describes this finding.
A)As age increases, the number of friends increases
B)As age increases, the number of friends decreases
C)As age decreases, the number of friends decreases
D)As age increases, the number of friends stays the same.
11

A ___________ occurs when the individuals in a study are very homogenous.
A)restriction of range
B)curvilinear relationship
C)forced linear relationship
D)negative relationship
12

r2 is sometimes referred to as _________.
A)transformed coefficient
B)the percent of shared variance between two variables.
C)the "unexplained" variability
D)Both a and c.
13

By using a regression equation, researchers can predict the ________ variable on the basis of a ________ variable.
A)constant; predictor
B)criterion; incremental
C)criterion; predictor
D)incremental; regressed.
14

A technique called __________ is used to combine a number of __________ variables to increase the accuracy of the prediction of a given outcome variable.
A)multiple outcome; criterion
B)Pearson Product-Moment Correlation; predictor
C)multiple regression correlation; criterion
D)multiple correlation; predictor
15

A technique called __________ provides a way of statistically controlling third variables.
A)multiple correlation
B)simple correlation
C)partial correlation
D)partitioned correlation





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