COMM CHAPTER 2-(2025 ))WITH
QUESTIONS AND CORRECT ANSWERS.
A stem-and-leaf display is a graphical portrayal of a data set that shows the data
set's overall pattern of
variation. - ANSWER true
The relative frequency is the frequency of a class divided by the total number of
measurements. - ANSWER true
A bar chart is a graphic that can be used to depict qualitative data - ANSWER true
Stem-and-leaf displays and dot plots are useful for detecting outliers. - ANSWER
true
A scatter plot can be used to identify outliers. - ANSWER false
When looking at the shape of the distribution using a stem-and-leaf, a distribution is
skewed to the
right when the left tail is shorter than the right tail. - ANSWER true
When we wish to summarize the proportion (or fraction) of items in a class we use
the frequency
distribution for each class. - ANSWER false
When establishing the classes for a frequency table it is generally agreed that the
more classes you use
the better your frequency table will be. - ANSWER false
The sample cumulative distribution function is non-decreasing. - ANSWER true
A frequency table includes row and column percentages. - ANSWER false
A(n) ______ is a graph of a cumulative distribution. - ANSWER Ogive plot
________ can be used to study the relationship between two variables. - ANSWER
Crosstabulation tables
Row or column percentages can be found in: - ANSWER Crosstabulation tables
All of the following are used to describe quantitative data except the - ANSWER pie
chart
An observation separated from the rest of the data is a(n) - ANSWER outlier
Which of the following graphs is for qualitative data? - ANSWER Bar Chart
A Stem and Leaf display is best used to - ANSWER Display the shape of the
distribution.
, COMM CHAPTER 2-(2025 ))WITH
QUESTIONS AND CORRECT ANSWERS.
When grouping a large sample of items into classes, the ______________ is a
better tool than the
___________. - ANSWER Histogram, stem and leaf display
A ______________ displays the frequency of each group with qualitative data and a
____________
displays the frequency of each group with quantitative data. - ANSWER Bar chart,
histogram
A ______________ shows the relationship between two variables - ANSWER
Scatter Plot
A ______________ can be used to differentiate the "vital few" causes of quality
problems from
the "trivial many" causes of quality problems. - ANSWER Pareto chart
______________ and _____________ are used to describe qualitative (categorical)
data. - ANSWER Bar charts, pie charts
Which one of the following statistical tools is used with quantitative data? -
ANSWER Histogram
When developing a frequency distribution the class (group), intervals should be -
ANSWER mutually exclusive.
Which of the following graphical tools is not used to study the shapes of
distributions? - ANSWER Scatter plot
All of the following are used to describe qualitative data except the: - ANSWER
Histogram
If there are 130 values in a data set, how many classes should be created for a
frequency histogram? - ANSWER 8
If there are 120 values in a data set, how many classes should be created for a
frequency histogram? - ANSWER 7
If there are 62 values in a data set, how many classes should be created for a
frequency histogram? - ANSWER 6
If there are 30 values in a data set, how many classes should be created for a
frequency histogram? - ANSWER 5
A CFO is looking at how much of a company's resources are spent on computing.
He
samples companies in the pharmaceutical industry and developed the following
stem-and-leaf - ANSWER Skewed to the right
QUESTIONS AND CORRECT ANSWERS.
A stem-and-leaf display is a graphical portrayal of a data set that shows the data
set's overall pattern of
variation. - ANSWER true
The relative frequency is the frequency of a class divided by the total number of
measurements. - ANSWER true
A bar chart is a graphic that can be used to depict qualitative data - ANSWER true
Stem-and-leaf displays and dot plots are useful for detecting outliers. - ANSWER
true
A scatter plot can be used to identify outliers. - ANSWER false
When looking at the shape of the distribution using a stem-and-leaf, a distribution is
skewed to the
right when the left tail is shorter than the right tail. - ANSWER true
When we wish to summarize the proportion (or fraction) of items in a class we use
the frequency
distribution for each class. - ANSWER false
When establishing the classes for a frequency table it is generally agreed that the
more classes you use
the better your frequency table will be. - ANSWER false
The sample cumulative distribution function is non-decreasing. - ANSWER true
A frequency table includes row and column percentages. - ANSWER false
A(n) ______ is a graph of a cumulative distribution. - ANSWER Ogive plot
________ can be used to study the relationship between two variables. - ANSWER
Crosstabulation tables
Row or column percentages can be found in: - ANSWER Crosstabulation tables
All of the following are used to describe quantitative data except the - ANSWER pie
chart
An observation separated from the rest of the data is a(n) - ANSWER outlier
Which of the following graphs is for qualitative data? - ANSWER Bar Chart
A Stem and Leaf display is best used to - ANSWER Display the shape of the
distribution.
, COMM CHAPTER 2-(2025 ))WITH
QUESTIONS AND CORRECT ANSWERS.
When grouping a large sample of items into classes, the ______________ is a
better tool than the
___________. - ANSWER Histogram, stem and leaf display
A ______________ displays the frequency of each group with qualitative data and a
____________
displays the frequency of each group with quantitative data. - ANSWER Bar chart,
histogram
A ______________ shows the relationship between two variables - ANSWER
Scatter Plot
A ______________ can be used to differentiate the "vital few" causes of quality
problems from
the "trivial many" causes of quality problems. - ANSWER Pareto chart
______________ and _____________ are used to describe qualitative (categorical)
data. - ANSWER Bar charts, pie charts
Which one of the following statistical tools is used with quantitative data? -
ANSWER Histogram
When developing a frequency distribution the class (group), intervals should be -
ANSWER mutually exclusive.
Which of the following graphical tools is not used to study the shapes of
distributions? - ANSWER Scatter plot
All of the following are used to describe qualitative data except the: - ANSWER
Histogram
If there are 130 values in a data set, how many classes should be created for a
frequency histogram? - ANSWER 8
If there are 120 values in a data set, how many classes should be created for a
frequency histogram? - ANSWER 7
If there are 62 values in a data set, how many classes should be created for a
frequency histogram? - ANSWER 6
If there are 30 values in a data set, how many classes should be created for a
frequency histogram? - ANSWER 5
A CFO is looking at how much of a company's resources are spent on computing.
He
samples companies in the pharmaceutical industry and developed the following
stem-and-leaf - ANSWER Skewed to the right
