When one variable causes change in another, we call the first variable the
___________________ variable*.
The affected variable is called the _______________ variable*. - 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. - 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. - 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 __________________________. - 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. - 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. - ANSWER-Categorical
Quantitative
Which variable, explanatory or response, is displayed on the x -axis on side-by-
side boxplots? - 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. - ANSWER-Quantitative
The relationship between the x -variable and the y -variable is called
_____________. - ANSWER-Correlation
What determines the location of a dot on a scatterplot? - ANSWER-A dot is placed
on a scatterplot according to its
x - and y -value.
When analyzing a possible relationship for two-variable data, if both variables are
categorical, what is the most appropriate choice to display the data?
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