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Multiple Choice
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1
The levels of nominal scale variables are simply _________.
A)rank-ordered items
B)numbers
C)different categories or groups
D)physical measures
2
In many experiments, the independent variable is manipulated by forming two groups. Such independent variables in experiments are __________.
A)nominal
B)ordinal
C)interval
D)ratio
3
Which of the following is a ratio scale variable?
A)eye color
B)marital status
C)weight
D)both a and b
4
A __________ of exam scores reveals how many students received a given score on the exam.
A)predictor graph
B)path analysis
C)central tendency graph
D)frequency distribution
5
A frequency __________ uses a line to represent the frequency of each score in a distribution.
A)bar graph
B)scatterplot
C)frequency polygon
D)frequency distribution
6
The _________ is the score that divides the group in half.
A)mean
B)median
C)mode
D)standard deviation
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)variability
D)central tendency
9
A Pearson r correlation coefficient describes the __________ and the _________ of a linear relationship between two interval scale or ratio scale variables.
A)level; strength
B)direction; variability
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)the transformed coefficient
B)the percent of shared variance between two variables
C)"unexplained" variability
D)both b 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)moderator; control
14
The correlation between a combined set of predictor variables and a given criterion variable is called:
A)multiple outcome correlcation
B)Pearson Product-Moment correlation
C)regression correlation
D)multiple correlation
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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