1. Warm up…
Page 297 practice quiz at the bottom of the page.

2. ACC math…
If you no longer want to hold on to old practices you can return them to me and we’ll recycle the paper 

3. 5.7 Scatter plots

4. SWBAT… Interpret points on a scatter plot
Write equations for lines of fit (best fit lines)

5. A scatter plot is a graph in which sets of data are plotted as ordered pairs on a coordinate plane.
Scatter plots are used to represent a relationship between two sets of data

6. Three types of relationships…
1st type: Positive correlation between x and y. that is as x increases, y increases
2nd type: negative correlation between x and y. That is as x decreases, y decreases.
3rd type: NO correlation. That is x and y are not related.

7. Example 1
Determine whether each graph shows a positive, negative, or no correlation. If there is a positive or negative correlation, describe its meaning in the situation.
The graph shows the weight and the highway gas mileage of selected cars
The graph shows fat grams and Calories for selected choices at a fast-food restaurant.

8. Lines of fit…
If data points do not all lie on a line, but are close to a line, you can draw a line of fit.
This line describes the trend of the data.
Also called the best fit line.

9. Example 2
The table shows an estimate for the number of bald eagle pairs in the United States for certain years since 1985.
Years since 1985 3 5 7 9 11 14
Bald Eagle Pairs
2500
3000
3700
4500
5000
5800
a. Use the calculator to find and equation for the line of fit
b. Use the equation for the line fit to estimate the number of bald eagle pairs in 1998.

10. The table shows the world population growing at a rapid rate.
Use the calculator to find an equation for the line of fit.
Use the equation to predict the population in 2010.
YEAR
POPULATION
1650
500
1850
1000
1930
2000
1975
4000
1998
5900