SOLVE & GRAPH7442 yandy

SOLVE & GRAPH

6 11 13 3 2 9( )x or x

SOLVE & GRAPH

04162

18572 xorxx

GRAPHING LINEAR INEQUALITIES Graph 2x-3y<9

GRAPHING LINEAR INEQUALITIES Graph 3x+4y > -8

GRAPHING LINEAR INEQUALITIES Graph -2x-5y>15

SCATTERPLOTS & LINE OF BEST

FIT

CREATE A SCATTERPLOT & FIND THE LINE OF BEST FIT.

Wt Cl (kg)

Total Lifted (kg)

46 140

50 127

54 165

59 167

64 192

70 185

76 198

83 200

USING THE GRAPHING CALCULATOR:

GRAPHING STEPS CONTINUED

CORRELATION Used to describe the relationship

between the independent variable (x) and the dependent variable (y).

It’s on a scale from -1 to 1 with the endpoints representing a perfect linear relationship.

TYPES OF CORRELATION

0

10

20

30

40

50

60

70

80

90

0 10 20 30 40 50

0

10

20

30

40

50

60

70

80

90

100

0 20 40 60 80

0

20

40

60

80

100

120

0 20 40 60 80 100

This refers back to the problem about weight classes

LET’S TRY ANOTHER ONE! USE IT TO PREDICT THE SODIUM FOR 40 G OF FAT.

Fat (g) Sodium

19 920

31 1500

34 1310

35 860

39 1180

39 940

43 1260

PRACTICE PROBLEM

Age 18 20 20 22 24 25 25 26 28 30 30 31 32 33 35 45

#CDs 12 15 18 12 10 8 6 6 4 4 4 2 2 3 6 1

a. Find equation of the least-squares line.

b. Find and explain the correlation coefficient, r.

c. Predict the number of CD’s purchased by a person who is 27 years old.

d. Find the age of a person who purchased 15 CD’s in the previous year.