Section 4.4 Homework

1.  What is meant by a marginal​ distribution? What is meant by a conditional​ distribution?  What is meant by a marginal​ distribution?

1. A marginal distribution is a frequency or relative frequency distribution of either the row or column variable in a contingency table.
2. A marginal distribution is the relative distribution of both row or column variables in the contingency table.
3. A marginal distribution is the effect of either row variable or the column variable in the contingency table.
4. A marginal distribution is the relative frequency of each category of one​ variable, given a specific value of the other variable in a contingency table.

What is meant by a conditional​ distribution?

1. A conditional distribution is the relative distribution of both row or column variables in the contingency table.
2. A conditional distribution is the relative association between two categorical variables in the contingency table.
3. A conditional distribution is a frequency or relative frequency distribution of either the row or column variable in a contingency table.
4. A conditional distribution lists the relative frequency of each category of the response​ variable, given a specific value of the explanatory variable in a contingency table.

2.   A survey of 1030 randomly selected registered United States voters was conducted in which survey participants were​ asked, “What is your political​ affiliation?” Results of the survey by gender are shown below. Complete parts​ (a) and​ (b) below.

​(a) Complete the following statement. 

In the contingency table​ shown, the ______ variable is gender and the ______ variable is political affiliation.

​(b) How many males in this survey are also​ democrats?

The number of males who are democrat in the survey is _______