7.
IQ tests are standardized so that the mean score is 100 for the entire group of people who
take the test. However, if you select a group of 50 who took the test, you probably would
not get 100. What statistical concept explains the difference between the two means?
A.
Statistical error
B.
Inferential error
C.
Residual error
D.
Sampling error
8.
A researchers studies the factors that determine the number of children future couples
decide to have. The variable ‘number of children’ is a :
A.
Discrete variable
B.
Continuous variable
C.
Categorical variable
D.
Ordinal variable
9.
A teacher asks students to identity their favorite reality television show. What type of
measurement scale do the different television shows make up?
A.
Nominal
B.
Ordinal
C.
Interval
D.
Ratio
10.
The median is always:
A.
The most frequently occurring score in a data set
B.
The middle score when results are ranked in order of magnitude
C.
The same as the mean
D.
The difference between the maximum and minimum scores.
11.
The seminar rooms in the library are identified by the letters A to H. A researcher records
the number of classes held in each room during the first semester. What kind of graph
would be appropriate to present the frequency distributions of these data?
A.
Histogram
B.
Scatterplot
C.
Bar chart
D.
Box plot
12.
A set of scores is presented in a histogram. The histogram shows a series of bars that tend
to decrease in height from left to right. What is the shape of the distribution?
A.
Leptokurtic
B.
Positively skewed
C.
Negativity skewed
D.
Normal