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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.
