Students in 5 different 2nd grade classes are timed to see how long it takes to correctly answer 50 addition and subtraction problems. Each class was then taught a different strategy for basic arithmetic for one month. After the month, the students were again timed to see how long it takes to correctly answer 50 similar problems. The dot plots below show the differences in times for the students (difference after before) for each of the five classes. Which dot plot appears to indicate an improvement in time for the class? A B C D E -4 033 000 goxx.com goooo 0 • 8 88 O 88 888 88 808 80 80 8000 0 -2 O cooo 8000 2 08 우 O 4 08. - . 8 . . § 1.8 8. 0800 80 6 8 10 12

Students in 5 different 2nd grade classes are timed to see how long it takes to correctly answer 50 addition and subtraction problems. Each class was then taught a different strategy for basic arithmetic for one month. After the month, the students were again timed to see how long it takes to correctly answer 50 similar problems. The dot plots below show the differences in times for the students (difference after before) for each of the five classes. Which dot plot appears to indicate an improvement in time for the class? A B C D E -4 033 000 goxx.com goooo 0 • 8 88 O 88 888 88 808 80 80 8000 0 -2 O cooo 8000 2 08 우 O 4 08. - . 8 . . § 1.8 8. 0800 80 6 8 10 12

Algebra: Structure And Method, Book 1

(REV)00th Edition

ISBN:9780395977224

Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Chapter3: Solving Equation And Problems

Section3.6: Problem Solving: Using Charts

Problem 2OE

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