Griffin Middle School Math 8 â€“ Unit 5 Scatter Plots Name _______________________ Teacher _____________________ _________________

Period _______________ Date

Unit 5 M8D4 Statistical data: Students will organize, interpret, and make inferences from statistical data. M8D4.b Line of fit from a scatter plot. Students will estimate and determine a line of best fit from a scatter plot.

Part I How tall am I? Have a partner hold the measuring tape and measure your height to the nearest inch. My height = ______________ inches *Remember 1 foot = 12 inches. Example 5.5 ft = 66 inches

What is my shoe size?

My shoe size is __________ .

Part II Predict the correlation of your data. Will the data have a: a. Positive correlation b. Negative correlation c. No correlation

y H e i g h t

x Shoe size

Defend your answer choice in complete sentences.

Griffin Middle School Math 8 – Unit 5 Scatter Plots

Part II Survey 50 people. Ask them their height and shoe size. Shoe Size (x) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

Height (inches) (y)

Student initials

Griffin Middle School Math 8 â€“ Unit 5 Scatter Plots 39 40 41 42 43 44 45 46 47 48 49 50

Complete your graph by plotting the points from your data. Then draw a line of best fit.

Choose two points from the line of best fit on your graph. (_____, ______) and (________, ________) Use the slope formula y - y and find the slope __________. xâ€“x Find the y-intercept._____________. Why does the value of y-intercept not apply? __________________________________________________________________________ __ Would negative number make since in this graph? Why or why not? __________________________________________________________________________ ___ Write an equation for you line of best fit. _________________

Griffin Middle School Math 8 â€“ Unit 5 Scatter Plots

Anaylze and Predict Scenario: A set of footprints left at a crime scene measure size 15. Based on your scatter plot, estimate the height of the person who left the footprints. Explain how you determined your answer. Defend your answer choice in complete sentences.