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Section 7.1 (Part 2) 7.1 HW Quiz: Friday 7.1, 7.2 Quiz: Next Week sometime 7.1, 7.2, 7.7 Test: Sept. 22 Make-up work needs to be made up by Monday afternoon!

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Finding the line of best-fit There are several methods for finding “best-fit lines.” We’re going to look at three of those methods: Visually estimating Visually estimating Linear-regression line Linear-regression line Median-median line Median-median line

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Median-Median Line This one’s a little more complicated. Can you arrange these points in order by x-values from least to greatest? (8, 26), (2, 15), (11, 32), (1, 15), (8, 23), (4, 18), (9, 27), (5, 21) There’s MORE! Let’s look at the handout for this one!

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(1,15)(2,15)(4,18)(5,21)(8,26)(8,23)(9,27)(11,32) (1,15)(2,15)(4,18)(5,21)(8,23)(8,26)(9,27)(11,32) Need to find the average to find the median point The next slide will help you fill out the handout…

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15 (9, 27) (6.5,22) (2, 15) 27 6.5 27 - 15 9 - 2 =1.71 y = 1.71x + b 15 = 1.71(2) + b 1.7111.58 11.58 = b 22 1.71(6.5) + 11.58 y = 22.7 2222.711.58 New b = 11.35 Final Equation: y = 1.71x + 11.35 Add to your handout

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Practice M-M-L’s Use the following data: (1, 22), (2, 27), (2, 20), (3, 15), (4, 19), (5, 10), (5, 14), (6, 9), (8, 7), (8, 11), (8, 13), (9, 5) Answer: y = -2x + 24

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One more time!! (12,42), (15,72), (17,81), (11,95), (8,98), (14,78), (9,83), (13,87), (13,92) (8,98)(9,83)(11,95)(12,42)(13,87)(13,92)(14,78)(15,72)(17,81) Look at your “y” values for each group….are they in order??? Answer: y = -2.83x + 121.58

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Start Classwork/Homework: 7.1 (part 2) WS 7.1 (part 2) WS IF we have time we will go over the answers before you leave ***7.1 HW Quiz Tomorrow!***

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