STAT CHAP 4.4

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

A marginal distribution is a frequency or relative frequency distribution of either the row or column variable in a contingency table. 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.

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

In the contingency table​ shown, the row variable is gender and the column variable is political affiliation. The number of males who are democrat in the survey is 146

Consider the data set given in the accompanying table. Construct a frequency marginal distribution.

STAT--TABLES--CONTINGUENCY--SUMMARY ROW LABEL IS THE FIRST OPTION-- COMPUTE

Consider the data set given in the accompanying table. Construct a relative frequency marginal distribution.

STAT--TABLES--CONTINGUENCY--SUMMARY--FOR DISPLAY PICK ROW PERCENT AND COLUMN PERCENT IF ASKED IN THREE DEC WRITE IT LIKE THIS EX: 40% BECOMES 0.400