QUIZ 1
Using the average score to describe a sample is an example of inferential statistics.
FALSE
A researcher is interested in the average income for registered voters in the United States.
The entire group of registered voters is an example of a population. TRUE
A researcher interested in vocabulary development obtains a sample of 3yearold
children to participate in a research study. The average score for the group of children is
an example of a parameter. FALSE
The goal for an experiment is to demonstrate that changes in one variable are responsible
for causing changes in a second variable. TRUE
A correlational study typically uses only one group of participants but measures two
different variables (two scores) for each individual. TRUE
A correlational study is used to examine the relationship between two variables but
cannot determine whether it is a causeandeffect relationship. TRUE
A recent report concluded that college graduates have higher lifesatisfaction scores than
individuals who do not receive college degrees. For this study, graduating versus not
graduating is an example of a quasiindependent variable. TRUE
A discrete variable must be measured on a nominal or an ordinal scale. FALSE
Classifying people into two groups on the basis of gender is an example of measurement
on an ordinal scale. FALSE
To compute SX
2
, you first add the scores, then square the total. FALSE
The final step in computing S(X + 1)
2
is to square the sum of the (X + 1) values. FALSE
For the following scores, S(X + 1)
2
= 81.
Scores: 1, 3, 0, 1 FALSE
For the following scores, SX
2
= 35.
Scores: 1, 3,5
TRUE
For the following distribution of scores, 20% of the individuals have scores of X = 1.
X
f
5
2
4
8
3
5
2
3
1
2
FALSE
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A grouped frequency distribution table lists one interval as 2029. The width of this
interval is 9 points. FALSE
A grouped frequency distribution table does not provide enough information to obtain a
complete listing of the original set of scores. TRUE
A professor records the number of students who are absent each day for the
semester. Because this is a discrete variable, a bar graph should be used to show the
frequency distribution. FALSE
A sports historian recorded the number of times that the New York Yankees finished 1
st
,
2
nd
, 3
rd
, and so on, in their division for the past 20 years. If the results are presented in a
frequency distribution graph, then a histogram should be used. FALSE
The classrooms in the Psychology department are numbered from 100 to 108. A
professor records the number of classes held in each room during the fall semester. If the
results were presented in a frequency distribution graph, the professor should use a bar
graph. TRUE
The normal distribution is an example of a symmetrical distribution. TRUE
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 Winter '16
 Urajnik
 Statistics, Inferential Statistics

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