NAME ______DATE______PERIOD ______
Lesson 2 Homework Practice
Use Trend Lines to Make Predictions
1. Salina is having a surprise party for her friend Ernie. Thetable shows how many balloons she has been able to blow up by the endof each 10-minute segment.
a. Construct a scatterplot of the data. Then draw andassess a trend line that seems to best represent the data.
b. Use the trend line to make a prediction about thenumber of balloons she will have blown up at theend of 70 minutes.
2. Sidney is selling his comic book collectionon the Internet. The scatterplot shows how many comicbooks he has left at the end of each day.
a. Write an equation in slope-intercept form for the trend linethat is drawn.
b. Use the equation to make a prediction about thenumber of comic books he will have at the endof the seventh day.
3. Maury has an ice rink in his back yard. Thescatterplot shows the thickness of the ice relativeto the temperature.
a. Write an equation in slope-intercept form for the trend linethat is drawn.
b. Use the equation to make a prediction about the temperature if the ice is 2 inches thick.
Lesson 2 Problem-Solving Practice
Use Trend Lines to Make Predictions
Haley has a leaf-raking company to help offset school costs.The table shows how many bags of leaves Haley was able tofill each hour. Use the information in the table to answerExercises 1 and 2.
1. Construct a scatterplot of the data.Then draw and assess a trend line thatrepresents the data. / 2. Use the line of best fit to make a prediction as to how many bags ofleaves Haley will have filled at the endof 7 hours of raking.Cleo’s baby pool has a leak. The scatterplotshows the amount of water left in the pool at the endof each 5-minute segment. Use the information in thescatterplot to answer Exercises 3 and 4.
3. Write an equation in slope-interceptform for the trend line that is drawn. / 4. Use the equation to make a prediction about the amount of water left in thepool after 40 minutes.Course 3 • Chapter 9 Scatterplots and Data Analysis