WGU C784-Statistics Mod 4
questions and answers
Define Mode - correct answer The value that occurs most often in a data set
The Mean of a data set represents the? - correct answer Average
Median of a data set - correct answer The middle value of the data set
What are the two types of variables - correct answer 1) Quantitative Variable 2) Categorical Variable
Quantitative variable - correct answer Quantitative variable - a variable that takes a numerical value that
can be counted or measured.
Examples: height, weight, age, cholesterol level, exam scores
Categorical variable - correct answer Categorical variable - a variable that is not measured; it is a
"category" or a label; it places the individual in a certain group.
Examples: gender, months of the year, zip codes
List Two Graphical Displays for Categorical Data - correct answer 1) Pie Charts 2) Bar Charts
___________________ - best when we want to display different parts of a whole - correct answer Pie
Charts.
_______________________ - best to display counts or frequencies for the categories - correct answer
Bar Charts.
List the 4 different Graphical Displays for Quantitative Data - correct answer Dot Plot - Best to display
the distribution of data, particularly clusters, gaps, and outliers. Most useful for smaller data sets.
, Stem Plot (or Stem and Leaf Plot) - Best to display the distribution or shape of data according to place
values. Keeps information about individual data points.
Box Plot - Best to display the center, spread, and outliers of a given data set.
Histogram - Best to display the distribution (shape and spread) of quantitative data. Works well with
large data sets.
A stem plot is constructed by separating each data value into a stem and a leaf. The leaf is the
__________ most digit, and the stem consists of all of the digits to the __________ of the leaf. - correct
answer A stem plot is constructed by separating each data value into a stem and a leaf. The leaf is the
right most digit, and the stem consists of all of the digits to the left of the leaf.
Note: Represent each number that is in the ones place from the list of numbers. By doing this the stems
will consist of ones, twos, threes, and fours. Next list the leafs by taking the digit to the right and writing
it within the coloumn/stem that matches the ones place holder of the number. Example 31 the ones
place/ stem is "3" the Leaf which is to the right of the number is "1".
After listing all stems and leafs. Re-arrange them in increasing order.
If the list of numbers is long or big you can split the stem and leaf into two sets. Ex. the first stem set of 1
will list any leafs 1-5 while the second stem leaf set can list any leafs 6-9. See thirs graph for illustration
What 4 analysis are needed to describe a distribution - correct answer 1. The shape of the graphical
display
2. The center and spread of the data
3. The maximum and minimum values
4. Any values that could be outliers
What are the Numerical Measures of Center - correct answer Mean: "Average"
Median: "Middle"
Mode: "Most frequently occurring"
questions and answers
Define Mode - correct answer The value that occurs most often in a data set
The Mean of a data set represents the? - correct answer Average
Median of a data set - correct answer The middle value of the data set
What are the two types of variables - correct answer 1) Quantitative Variable 2) Categorical Variable
Quantitative variable - correct answer Quantitative variable - a variable that takes a numerical value that
can be counted or measured.
Examples: height, weight, age, cholesterol level, exam scores
Categorical variable - correct answer Categorical variable - a variable that is not measured; it is a
"category" or a label; it places the individual in a certain group.
Examples: gender, months of the year, zip codes
List Two Graphical Displays for Categorical Data - correct answer 1) Pie Charts 2) Bar Charts
___________________ - best when we want to display different parts of a whole - correct answer Pie
Charts.
_______________________ - best to display counts or frequencies for the categories - correct answer
Bar Charts.
List the 4 different Graphical Displays for Quantitative Data - correct answer Dot Plot - Best to display
the distribution of data, particularly clusters, gaps, and outliers. Most useful for smaller data sets.
, Stem Plot (or Stem and Leaf Plot) - Best to display the distribution or shape of data according to place
values. Keeps information about individual data points.
Box Plot - Best to display the center, spread, and outliers of a given data set.
Histogram - Best to display the distribution (shape and spread) of quantitative data. Works well with
large data sets.
A stem plot is constructed by separating each data value into a stem and a leaf. The leaf is the
__________ most digit, and the stem consists of all of the digits to the __________ of the leaf. - correct
answer A stem plot is constructed by separating each data value into a stem and a leaf. The leaf is the
right most digit, and the stem consists of all of the digits to the left of the leaf.
Note: Represent each number that is in the ones place from the list of numbers. By doing this the stems
will consist of ones, twos, threes, and fours. Next list the leafs by taking the digit to the right and writing
it within the coloumn/stem that matches the ones place holder of the number. Example 31 the ones
place/ stem is "3" the Leaf which is to the right of the number is "1".
After listing all stems and leafs. Re-arrange them in increasing order.
If the list of numbers is long or big you can split the stem and leaf into two sets. Ex. the first stem set of 1
will list any leafs 1-5 while the second stem leaf set can list any leafs 6-9. See thirs graph for illustration
What 4 analysis are needed to describe a distribution - correct answer 1. The shape of the graphical
display
2. The center and spread of the data
3. The maximum and minimum values
4. Any values that could be outliers
What are the Numerical Measures of Center - correct answer Mean: "Average"
Median: "Middle"
Mode: "Most frequently occurring"
