Name_________________________________________Date______________Period_______
Unfortunately, the group had measured the lowest point of Barbie’s head in
inches instead of centimeters. To fix this they multiplied the inches by 2.54
(1 in. = 2.54 cm). The new data is below.
Number of Rubber Bands
0
1
2
3
4
5
6
7
Lowest point head reaches (cm)
30.48
35.56
43.18
45.72
55.88
58.42
67.04
76.20
2. How do you think these changes will affect the correlation? Verifying
by calculating the correlation in the applet.
It changed by one number
r=0.993
3. One of the group members snuck some extra rubber bands to collect
more data. Add the point (15 rubber bands, 124.5 cm) to your scatter
plot. How do you think this outlier will affect the correlation? Verify in
the applet.
It only changed by one number.
r=0.998
4. One group member accidentally left off a digit. Add the point (6
rubber bands, 7.04 cm) to the scatter plot. How do you think this
outlier will affect the correlation? Verify in the applet.
It shifted by 200.
r=0.796
