Name ________________________________________ Date ___________________ Class __________________ Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor. 4-36 Holt McDougal Algebra 1 Practice B Scatter Plots and Trend Lines Graph a scatter plot using the given data. 1. The table shows the percent of people ages 18–24 who reported they voted in the presidential elections. Graph a scatter plot using the given data. Year 1988 1992 1996 2000 2004 % of 18-24 year olds 36 43 32 32 42 Write positive, negative, or none to describe the correlation illustrated by each scatter plot. 2. 3. ________________________________________ ________________________________________ 4. Identify the correlation you would expect to see between the number of pets a person has and the number of times they go to a pet store. Explain. ________________________________________________________________________________________ ________________________________________________________________________________________ Neal kept track of the number of minutes it took him to assemble sandwiches at his restaurant. The information is in the table below. Number of sandwiches 1 2 4 6 7 Minutes 3 4 5 6 7 5. Graph a scatter plot of the data. 6. Draw a trend line. 7. Describe the correlation. ________________________________________ 8. Based on the trend line you drew, predict the amount of time it will take Neal to assemble 12 sandwiches. ________________________________________ LESSON 4-5
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Name ________________________________________ Date ___________________ Class __________________
Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.
4-36 Holt McDougal Algebra 1
Practice B Scatter Plots and Trend Lines
Graph a scatter plot using the given data. 1. The table shows the percent of people ages 18–24
who reported they voted in the presidential elections. Graph a scatter plot using the given data.
Year 1988 1992 1996 2000 2004 % of 18-24 year olds 36 43 32 32 42
Write positive, negative, or none to describe the correlation illustrated by each scatter plot.
2. 3.
________________________________________ ________________________________________ 4. Identify the correlation you would expect to see between the number of pets a person has
and the number of times they go to a pet store. Explain.
________________________________________________________________________________________
________________________________________________________________________________________
Neal kept track of the number of minutes it took him to assemble sandwiches at his restaurant. The information is in the table below.
Number of sandwiches 1 2 4 6 7
Minutes 3 4 5 6 7
5. Graph a scatter plot of the data. 6. Draw a trend line. 7. Describe the correlation.
________________________________________
8. Based on the trend line you drew, predict the amount of time it will take Neal to assemble 12 sandwiches.
________________________________________
LESSON 4-5
Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.
A44 Holt McDougal Algebra 1
Reading Strategies 1. 2.
LESSON 4–5
Practice A 1.
2. positive 3. negative
4. positive; as the temperature goes up, more people would go in the pool to cool off.
5. no correlation; the height of a person has nothing to do with how many phone calls they make
6. Possible answer: about 38 batteries
Practice B 1. 2. negative 3. none 4. positive correlation; having more pets
means needing more food, toys, etc. 5-6. 7. positive 8. about 10 minutes
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