WGU C784-Statistics Mod 5 UPDATED
ACTUAL Exam Questions and CORRECT
Answers
When one variable causes change in another, we call the first variable the
___________________ variable*.
The affected variable is called the _______________ variable*. - CORRECT
ANSWER When one variable causes change in another, we call the first variable the
explanatory variable*.
The affected variable is called the response variable*.
In a randomized experiment, the researcher manipulates values of the explanatory variable and
measures the resulting changes in the response variable. The different values of the explanatory
variable are called treatments. An experimental unit is a single object or individual to be
measured.
A two-way table, also known as a two-way frequency table or contingency table, is used to show
the relationship between two ______________________variables ( C→C ); the rows show the
categories of one variable, and the columns show the categories of the other variable. -
CORRECT ANSWER categorical variables ( C→C )
______________________. These represent the total number of instances that fall in both the
corresponding row and header.
The data in the green cells show _______________________________. These are equal to the
sum of the number of individuals in the corresponding row or column. - CORRECT
ANSWER The cells in yellow show joint frequencies*. These represent the total number
of instances that fall in both the corresponding row and header.
For example, data in the "Male" row and "With Autism" column counts the number of males
with autism.
, The data in the green cells show marginal frequencies*. These are equal to the sum of the
number of individuals in the corresponding row or column. For example, data in the "Totals"
column and "Female" row shows the total number of females in the study. It may be helpful to
remember that marginal frequencies appear in the margins of the table.
The bottom, right cell (in both the "Totals" column and the "Totals" row) measures the total
number of individuals in the study.
The relationship between two variables that are both quantitative can be displayed in a
__________________________. - CORRECT ANSWER scatterplot;
As we've seen earlier, every point on a coordinate plane can be represented by an ordered pair*, (
x , y ). Here, the x -value is typically the _________________variable's value for a piece of data,
and the y -value is the corresponding value for the ________________________variable. A
simple way to remember this fact is that the term "explanatory" has an " x " in it. - CORRECT
ANSWER explanatory variable; response variable
Side-by-side box plots are a good choice for two-variable data where the explanatory variable is
____________ data and the response variable is ____________ data. - CORRECT
ANSWER Categorical
Quantitative
Which variable, explanatory or response, is displayed on the x -axis on side-by-side boxplots? -
CORRECT ANSWER Side-by-side boxplots can be horizontal or vertical, so either
variable (explanatory or response) can be displayed on the x -axis.
A scatterplot is a good choice to display two-variable data that are both __________ variables. -
CORRECT ANSWER Quantitative
The relationship between the x -variable and the y -variable is called _____________. -
CORRECT ANSWER Correlation
ACTUAL Exam Questions and CORRECT
Answers
When one variable causes change in another, we call the first variable the
___________________ variable*.
The affected variable is called the _______________ variable*. - CORRECT
ANSWER When one variable causes change in another, we call the first variable the
explanatory variable*.
The affected variable is called the response variable*.
In a randomized experiment, the researcher manipulates values of the explanatory variable and
measures the resulting changes in the response variable. The different values of the explanatory
variable are called treatments. An experimental unit is a single object or individual to be
measured.
A two-way table, also known as a two-way frequency table or contingency table, is used to show
the relationship between two ______________________variables ( C→C ); the rows show the
categories of one variable, and the columns show the categories of the other variable. -
CORRECT ANSWER categorical variables ( C→C )
______________________. These represent the total number of instances that fall in both the
corresponding row and header.
The data in the green cells show _______________________________. These are equal to the
sum of the number of individuals in the corresponding row or column. - CORRECT
ANSWER The cells in yellow show joint frequencies*. These represent the total number
of instances that fall in both the corresponding row and header.
For example, data in the "Male" row and "With Autism" column counts the number of males
with autism.
, The data in the green cells show marginal frequencies*. These are equal to the sum of the
number of individuals in the corresponding row or column. For example, data in the "Totals"
column and "Female" row shows the total number of females in the study. It may be helpful to
remember that marginal frequencies appear in the margins of the table.
The bottom, right cell (in both the "Totals" column and the "Totals" row) measures the total
number of individuals in the study.
The relationship between two variables that are both quantitative can be displayed in a
__________________________. - CORRECT ANSWER scatterplot;
As we've seen earlier, every point on a coordinate plane can be represented by an ordered pair*, (
x , y ). Here, the x -value is typically the _________________variable's value for a piece of data,
and the y -value is the corresponding value for the ________________________variable. A
simple way to remember this fact is that the term "explanatory" has an " x " in it. - CORRECT
ANSWER explanatory variable; response variable
Side-by-side box plots are a good choice for two-variable data where the explanatory variable is
____________ data and the response variable is ____________ data. - CORRECT
ANSWER Categorical
Quantitative
Which variable, explanatory or response, is displayed on the x -axis on side-by-side boxplots? -
CORRECT ANSWER Side-by-side boxplots can be horizontal or vertical, so either
variable (explanatory or response) can be displayed on the x -axis.
A scatterplot is a good choice to display two-variable data that are both __________ variables. -
CORRECT ANSWER Quantitative
The relationship between the x -variable and the y -variable is called _____________. -
CORRECT ANSWER Correlation
