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# 1 7 Notes

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This is part of Ch 8 - Linear Functions.

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### 1 7 Notes

1. 1. Chapter 8 – Functions and Graphing 1.7 – Scatter Plots
2. 2. Scatter Plots <ul><li>A scatter plot is a graph that shows the relationship between two sets of data. </li></ul><ul><li>In a scatter plot, two sets of data are graphed as ordered pairs on a coordinate system. </li></ul>Scatter plot from http://www.army.mil/ArmyBTKC/i/focus/cpi_tools_13_S.gif
3. 3. <ul><li>The dependent variable can only be determined from the value of the independent variable. (The value of the y-coordinate depends on what the value of the x-coordinate is.) </li></ul><ul><li>An independent variable can be assigned any number from the domain of a relation. (This number usually relates to the x-axis.) </li></ul>
4. 4. If the points appear to suggest a line that slants upward to the right, there is a positive relationship . If the points appear to suggest a line that slants downward to the right, there is a negative relationship . If the points seem to be random, then there is no relationship .
5. 5. The table shows the average cost of a loaf a bread from 1920-2000. Make a scatter plot of the data. 99 2000 72 1990 52 1980 24 1970 20 1960 14 1950 8 1940 9 1930 12 1920 Cents Year
6. 6. Determine whether the scatter plot of the data for the following might show a positive, negative, or no relationship. Explain your answer. 62 64 66 68 70 72 74 76 78 80 2 4 6 8 10 12 14 16 18 20
7. 7. The table shows temperature in degrees Celsius and the corresponding temperatures in Fahrenheit. A. Make a scatter plot of the data. C. Predict the Fahrenheit temperature for 35 °C. B. Does the scatter plot show a relationship between °C and °F? Explain. 86 77 68 59 50 41 32 ° F 30 25 20 15 10 5 0 ° C
8. 8. Questions? <ul><li>Homework: </li></ul><ul><ul><ul><li>1.7 pg 42 #4 -19 </li></ul></ul></ul>