1. Warm Up Unit 1 Review
 is a term used in geometry to describe a function that moves an object a certain distance. The object is not altered in any other way. It is not rotated, reflected or re-sized.
True or False: Under the translation rule the point (2,5) will become (5,7)
Create a small graph on your paper, plot the points (1,4), (5,3), and (2,2). Now translate the figure 5 units left and 2 units down. What is the translation rule for this move?

2. Two Way Tables

3. Standards
MCC8.SP.4 Understand that patterns of association can also be seen in bivariate categorical data by displaying frequencies and relative frequencies in a two-way table. Construct and interpret a two-way table summarizing data on two categorical variables collected from the same subjects. Use relative frequencies calculated for rows or columns to describe possible association between the two variables

4. Essential Question
How do we organize categorical data?

5. Vocabulary Joint frequencies- Entries in the body of the table
Marginal frequencies- Entries in the “Total” row and “Total” column
Relative frequencies- How often something happens divided by all outcomes
Conditional frequencies- The frequency of outcomes divided by the row or column total

6. After this lesson
You will be able to construct and interpret a two way table comparing bivariate data

7. Comparing Data
How can we compare and show student’s favorite social media sites?
What are the variables we are comparing? (Bivariate data)
Students and Social Media Sites

8. Create a table comparing students and their favorite social media site
Use the following sites: Facebook, Instagram, Twitter, and Tumblr
This is how we have displayed data so far, in a one way table.
Facebook
Twitter
Tumblr
Instagram
Students

9. Creating a two way table
At this point, we are comparing students vs. favorite social media sites, how can we change the subjects we are comparing to two categories?

10. Two-way table
Facebook
Twitter
Instagram
Tumblr
Total
Male
Female

11. Using the information in the table we created, find the following:
Joint Frequencies
Marginal Frequencies
Relative Frequencies
Conditional Frequencies