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Example 2-2a Objective Make line graphs and make predictions from graphs

Example 2-2a Vocabulary Line graph A type of statistical graph using lines to show how values change over a period of time

Example 2-2a Vocabulary Scatter plot Two sets of related data are plotted as ordered pairs on the same graph

Lesson 2 Contents Example 1Make and Use a Line Graph to Predict Example 2 Use a Scatter Plot to Predict

Example 2-1a TYPING Enrique is writing a 600-word paper for class. The table shows the time it has taken Enrique to type the paper so far. Make a line graph and predict the total time it will take him to type his paper. Time (min) Words Typed Decide on a scale and interval The scale must include 0 and 600 An appropriate interval would be 100 Remember to make your intervals easy

Example 2-1a Time (min) Words Typed Begin each line graph with 0 in the lower left corner Add 100 up the vertical scale labeling the lines Label the vertical axis

Example 2-1a Time (min) Words Typed Label the horizontal axis Since we are predicting you must include categories Reminder: Line graph uses the lines not the spaces

Example 2-1a Time (min) Words Typed Write a title with a relationship between the vertical and horizontal axis Time to Type a Paper

Example 2-1a Time (min) Words Typed Plot data vertically Time to Type a Paper

Example 2-1a Time (min) Words Typed Draw a line of best fit to predict how long it will take to type 600 words Time to Type a Paper

Example 2-1a Time (min) Words Typed Find where the line connects the 600 words and place a dot Time to Type a Paper

Example 2-1a Time (min) Words Typed Read the horizontal axis below the dot to estimate the time Time to Type a Paper About 14 minutes Answer:

Example 2-1b TRAVEL During a recent road trip, Helen kept track of the number of miles traveled after each hour of travel time was completed. The table below shows her information. Make a line graph and predict how far Helen will travel in 12 hours of travel time. Total Travel Time (hours)Miles /2

Example 2-1b Answer: In 12 hours, Helen will travel about 700 miles. 1/2

Example 2-2a POLLUTION The scatter plot shows the number of days that San Bernardino, California, failed to meet air quality standards from 1990 to Use it to predict the number of days of bad air quality in /2 Locate 2004 on the horizontal axis Move up the vertical axis to where the line crosses Move across the horizontal axis to the number of days

Example 2-2a POLLUTION The scatter plot shows the number of days that San Bernardino, California, failed to meet air quality standards from 1990 to Use it to predict the number of days of bad air quality in /2 Estimate the number of days they failed to meet standards in 2004 It is more than 40 but not half way between 40 and 60 About 45 days Answer:

Example 2-2b GAS MILEAGE The scatter plot shows the gas mileage based on the weight of a car. Use it to predict the gas mileage for a car weighing 5500 pounds. Answer: about 20 mpg * 2/2

End of Lesson 2 Assignment Lesson 2:2Making Predictions All