©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
SCMA 3040 Exam Questions With Correct
Answers
Tabulation is a systematic arrangement of statistical data in columns or rows in order to
describe the issue under study - answer✔true
An ogive shows values plotted agaisnt the mid-point of each class interval - answer✔false
6) _____ is a table that examines how one variable influences another variable.
A) a simple table
C) a grouped frequency table
D) a contigency table
E) none of the options - answer✔D) a contigency table
8) A cumulative relative frequency distribution shows _____
A) the proportion of data items with values less than the upper limit of each class
B) the proportion of data items with values less than the lower limit of each class
C) the proportion of data items with values more than the lower limit of each class
D) the proportion of data items with values more than the upper limit of each class -
answer✔A) the proportion of data items with values less than the upper limit of each class
16) which of the following graph types can be used for categorical data?
A) pie chart
C) histogram
D) line chart
E) time series - answer✔A) pie chart
1|Page
, ©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
9) an employment agency wishes to place 125 employees into desirable statistical groups based
on the time they spent commuting to work. The shortest time is 5 minutes and the longest
commuting time is 120 minutes.
The first group will have commuting time of _____
A) none of the options
B) 0-15 minutes
D) 5-15 minutes
E) 5-20 minutes - answer✔D) 5-15 minutes
17) which of the following graphs can best be used to display a relationship between 2
categorical variables?A) pie chart
B) stacked bar graph
D) scatterplot
E) histogram - answer✔B) stacked bar graph
10) a grouped frequency table that shows age distribution has the following class interval: 11-
20; 21-30; 41-50; 51-60; and 61-over. The problem with this classification is that
A) the classes are not mutually exclusive
B) the classes are not equal in width
C) the classes are not continuous
D) the classes are not exhaustive - answer✔C) the classes are not continuous
18) 15% of the students in the class are majoring in Justice studies, 20% in early childhood
studies, 35% in family and social work, and 30% in psychology. The appropriate graphical device
which can be used to present these data is _____
A) a pie chart
B) a line chart
C) a time series
D) a scatter diagram - answer✔A) a pie chart
A line chart shows values plotted against the upper limit of each class interval. - answer✔false
2|Page
, ©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
A bivariate data can visually be graphed using stacked and clustered bar graphs. - answer✔true
The mean measures the expected value of a data set - answer✔true
the mode refers the middle value in a ranked dataset - answer✔false
three-quarters of the values are less than the median - answer✔false
75% of the values are less than the third quarter - answer✔true
in computing the mean for a grouped data, the data values in each class are approximated
using the _____ - answer✔class midpoints
which measures of central tendency cuts the distribution in half when the scores are arranged
from low to high? - answer✔median
_____ is used when you want to report a common value in a dataset - answer✔mode
a categorical data which can't be ranked (e.g. marital status) can be summarized using the
_____ - answer✔mode
the following statements are true about the mean, except _____ - answer✔it is a preferred
measure when the distribution is skewed
the median is appropriate method to use for the following situations except when _____ -
answer✔you want to report an expected value
to measure the central point of a data distribution, the median would be preferred over the
mean because_____ - answer✔the data distribution has an extreme value
the first quartile is the same as the _____ - answer✔25th percentile
the inter-quartile range covers the _____ - answer✔middle half of a ranked data
In Excel, a highly right-skewed distribution has a skewness coefficient between + 0.5 and +1.00.
- answer✔false
Descriptive statistics for the closing stock prices of two companies for several trading periods
are shown below:
ABC Inc standard deviation = 1.12
XYZ Inc standard deviation = 3.21
3|Page
11/16/2024 10:16 AM
SCMA 3040 Exam Questions With Correct
Answers
Tabulation is a systematic arrangement of statistical data in columns or rows in order to
describe the issue under study - answer✔true
An ogive shows values plotted agaisnt the mid-point of each class interval - answer✔false
6) _____ is a table that examines how one variable influences another variable.
A) a simple table
C) a grouped frequency table
D) a contigency table
E) none of the options - answer✔D) a contigency table
8) A cumulative relative frequency distribution shows _____
A) the proportion of data items with values less than the upper limit of each class
B) the proportion of data items with values less than the lower limit of each class
C) the proportion of data items with values more than the lower limit of each class
D) the proportion of data items with values more than the upper limit of each class -
answer✔A) the proportion of data items with values less than the upper limit of each class
16) which of the following graph types can be used for categorical data?
A) pie chart
C) histogram
D) line chart
E) time series - answer✔A) pie chart
1|Page
, ©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
9) an employment agency wishes to place 125 employees into desirable statistical groups based
on the time they spent commuting to work. The shortest time is 5 minutes and the longest
commuting time is 120 minutes.
The first group will have commuting time of _____
A) none of the options
B) 0-15 minutes
D) 5-15 minutes
E) 5-20 minutes - answer✔D) 5-15 minutes
17) which of the following graphs can best be used to display a relationship between 2
categorical variables?A) pie chart
B) stacked bar graph
D) scatterplot
E) histogram - answer✔B) stacked bar graph
10) a grouped frequency table that shows age distribution has the following class interval: 11-
20; 21-30; 41-50; 51-60; and 61-over. The problem with this classification is that
A) the classes are not mutually exclusive
B) the classes are not equal in width
C) the classes are not continuous
D) the classes are not exhaustive - answer✔C) the classes are not continuous
18) 15% of the students in the class are majoring in Justice studies, 20% in early childhood
studies, 35% in family and social work, and 30% in psychology. The appropriate graphical device
which can be used to present these data is _____
A) a pie chart
B) a line chart
C) a time series
D) a scatter diagram - answer✔A) a pie chart
A line chart shows values plotted against the upper limit of each class interval. - answer✔false
2|Page
, ©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
A bivariate data can visually be graphed using stacked and clustered bar graphs. - answer✔true
The mean measures the expected value of a data set - answer✔true
the mode refers the middle value in a ranked dataset - answer✔false
three-quarters of the values are less than the median - answer✔false
75% of the values are less than the third quarter - answer✔true
in computing the mean for a grouped data, the data values in each class are approximated
using the _____ - answer✔class midpoints
which measures of central tendency cuts the distribution in half when the scores are arranged
from low to high? - answer✔median
_____ is used when you want to report a common value in a dataset - answer✔mode
a categorical data which can't be ranked (e.g. marital status) can be summarized using the
_____ - answer✔mode
the following statements are true about the mean, except _____ - answer✔it is a preferred
measure when the distribution is skewed
the median is appropriate method to use for the following situations except when _____ -
answer✔you want to report an expected value
to measure the central point of a data distribution, the median would be preferred over the
mean because_____ - answer✔the data distribution has an extreme value
the first quartile is the same as the _____ - answer✔25th percentile
the inter-quartile range covers the _____ - answer✔middle half of a ranked data
In Excel, a highly right-skewed distribution has a skewness coefficient between + 0.5 and +1.00.
- answer✔false
Descriptive statistics for the closing stock prices of two companies for several trading periods
are shown below:
ABC Inc standard deviation = 1.12
XYZ Inc standard deviation = 3.21
3|Page
