Best Fit 3
REMEMBER!

Type data tables in
STAT EDIT.

Use 4:LinReg(ax+b)
for line of best fit

Use 5:QuadReg for
curve or quadratic of
best fit

Determine the quadratic curve of best fit for the data. 

 

            {(-5, 8.1), (-2, -3.6), (-4, -15),

                     (0, 5.1), (1, 9.3), (-3, -8.2)}

y = 1.66x2 +8.34x +7.5

y = 1.66x2 +8.34x +8.22

y = 1.66x2 +8.34x +3.14

y = 1.66x2 +8.34x +2.12

Using your quadratic curve of best fit, estimate the

value of y when x = 3

 

            {(-5, 8.1), (-2, -3.6), (-4, -15),

                     (0, 5.1), (1, 9.3), (-3, -8.2)}

42

39

36

32

What is the equation for the line of best fit?

Benny is doing a Social Studies project investigating

trends over time.  He researched the price of eggs

over time. 

y = .056x - 110.29

y = .056x - 112.35

y = .056x - 115.13

y = .056x - 118.21

Based on your line of best fit, what will be the price of

a dozen eggs in 2015?

Benny is doing a Social Studies project investigating

trends over time.  He researched the price of eggs

over time. 

$2.42

$2.55

$2.15

$2.31

Determine the quadratic curve of best fit for the data. 

y = -0.211x2 + 849.6x - 767522

y = -0.211x2 + 849.6x - 345199

y = -0.211x2 + 849.6x - 854652

y = -0.211x2 + 849.6x - 982330

Using the quadratic curve of best fit, which equation

most closely represents the set of data?

 

{(-8, 80.4), (-7, 57.8), (-6, 38.6), (-5, 22.8), (3, 18.8),

(5, 51.8), (7, 98.4)}

y = x2 + 2x - 5

y = x2 - 3x + 5.2

y = 1.7x2 - 3x + 5

y = 1.7x2 + 2.9x - 5.2

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