# ALGEBRA 1 ~ Cell Phone Task Group: Kimberly Allen, Matt Blundin, Nancy Bowen, Anna Green, Lee Hale, Katie Owens

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1 ALGEBRA 1 ~ Cell Phone Task Group: Kimberly Allen, Matt Blundin, Nancy Bowen, Anna Green, Lee Hale, Katie Owens Math Essential Standards Approximate and interpret rates of change from graphical and numerical data. Create and use tabular, symbolic, graphical, and verbal representations and analyze and understand patterns, relations, and functions. Graphically display univariate and bivariate data and understand the implications of its characteristics. Lifelong learner Standards Plan and conduct research. Gather, organize, and analyze data, evaluate processes and products, and draw conclusions. Think analytically, critically, and creatively to pursue new ideas, acquire new knowledge, and make decisions. Understand and apply principles of logic and reasoning; develop, evaluate, and defend arguments. Acquire and use precise language to clearly communicate ideas, knowledge, and processes. Apply habits of mind and metacognitive strategies to plan, monitor, and evaluate one s own work. KUD s Collect data. Create a scatterplot from data. Calculate a line of best fit (calculator usage ok). Plot points and lines by hand. Task Students will research one type of phone for at least two different cell phone companies and determine which plan they would purchase. Students will create a scatterplot and determine a line of best fit relating the number of minutes to the monthly charge for each company and then compare their results. Students will write a synopsis describing which plan they chose and why that was the best choice for them. Time Frame 1 2 days of in class work with computer access (for researching cell phone companies). If 1 day of class, plan on giving students time outside of school to complete. Pre planning Sheet/Questions to consider: The average number of minutes I use per month: The average number of text messages I send per month: The average data usage per month: Other: List some local cell phone providers: List some cell phone models/features to consider (smart phone, keyboard, etc.)

3 Completed rubric Not turned in Partially complete Complete Cell Phone Task Name: Data Sheet Questions to consider: The average number of minutes I use per month: The average number of text messages I send per month: The average data usage per month: Other: List some local cell phone providers: List some cell phone models/features to consider (smart phone, keyboard, etc.) Choose two cell phone providers and one type of phone to investigate. My choices are: Phone type:

4 Cell Phone Task Student Response Sheet Name: 1. Scatterplots Company #1: Company #2: Line of Best Fit: Line of Best Fit: 2. Individual Cell Phone Plans Phone Choice: Company Choice: Plan Choice: # Minutes: # Text: Data: Total Cost: *Don t forget to attach your completed data sheet, synopsis, and completed rubric!

5 Cell Phone Task Rubric Name: Accurate Data Collection Not Proficient (1 point) Illegitimate data Proficient (2 points) Legitimate but inaccurate data Mastered (3 points) Legitimate and accurate data Student Score Teacher Score Accurate and complete legible scatterplots Complete and accurate lines of best fit Complete and legible data sheet All required information is not present and is unorganized Attempted, but incorrect, no work shown Not turned in present but unorganized Correct answer but no work shown Partially complete present, organized, and neatly done All steps completed, correct answers with all work shown Complete Detailed written synopsis Completed rubric Partial, not detailed Not turned in Meets requirements but no elaboration Partially complete Elaborate description of process and thoughts Complete Student Self Evaluation: out of (currently 18 points) Teacher Evaluation: out of (currently 18 points) Cell Phone Problem Modifications The cell phone problem was very engaging but requires some different mathematical options. The scatter plot idea was very confusing.

6 The new thought is to compare cell phone companies on a single graph as a systems problem. Because this is an Algebra I level problem, we are recommending that months be graphed on the x axis and cost be graphed on the y axis. Students are being asked to choose a phone model for each of two companies and write a linear equation based on monthly cost. They should graph these linear equations on the same graph. They should compare the costs at one year and two years for their choices before making a decision based on cost and other factors (such as preference, coverage, etc.) Here is a possible chart for organizing the data collection: Company # 1 Phone model and cost Insurance Monthly? Minutes Per Month? Data per Month? Texting Per Month? Tethering Per Month? Linear Equation For monthly cost Company # 2

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