2.5 SCATTER PLOTS AND CORRELATION
Scatter Plot: a graph of a set of data pairs (x,y)
Positive Correlation: y tends to increase as x increases
Negative Correlation: y tends to decrease as x increases
NO Correlation: the points show no obvious pattern
1.) Think of two variables that have a positive correlation:
2.) Think of two variables that have a negative correlation:
REGENTS SCORE VS. STUDY HOURS
Calculate the Best Fit Line by Hand: y = ___________________
Study
Regents Score
Hours
3
80
5
90
2
75
6
80
7
90
1
50
2
65
7
85
1
40
7
100
Find the BEST best fit line using your graphing calculator : y = _______________
The independent variable is ___________ and the dependent variable is ___________
Use interpolation to predict a student’s regents score if they studied for 4 hours _______
Interpret the slope of the regression lines in terms of hours of study and regents score.