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# 2-Way Tables

Lesson Plan for 1-31-13/2-1-13
by

## Leah Owens

on 1 February 2013

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#### Transcript of 2-Way Tables

2-Way Tables Before We Begin ... How Does It Work? Another One?! Example 1 You Try! (Example 2) Ok ... What Else? Example 3 2-Way Table The two-way table shows favorite activities for 50 adults.

Because the entries are frequency counts, the table is a frequency table.

Entries in the "Total" for rows and columns are called marginal frequencies.

Entries in the body of the table are called joint frequencies. This table shows the favorite activities in a different way called relative frequency.

The relative frequencies in the body of the table are called conditional frequencies. Two way tables can show frequencies for the whole table, for rows, or for columns.

The previous table showed relative frequencies for the whole table.

The table to the left shows relative frequencies for the rows, while the one on the right shows relative frequencies for the columns. The data from a survey of 50 students is shown in the Venn diagram. The students were asked whether or not they were taking a foreign language and whether or not they were playing a sport.

Create a table to represent the data. Jonathan surveyed students at his school. He found that 78 students own a cell phone and 57 of those students own an MP3 player. Nine students do not own either device. Construct a 2-way table summarizing the data. Use the two-way table you created from Example #1 to find the relative frequencies by row and column. How-To Guide! Frequency Ratio Used to examine
relationships between
categorical variables A measure of the number of times an event occurs A frequency count divided by total count
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