Use the provided data to examine whether the commercial improved the university’s image.

A major university would like to improve its tarnished image following a large on-campus scandal. Its marketing department develops a short television commercial and tests it on a sample of n = 10, the first ten students who entered a housing commons area who agreed to participate. Attitudes about the university are measured with a short questionnaire, both before and after viewing the commercial. Attitudes were on a scale of 0 – 20, which higher numbers reflecting better attitudes. Use the provided data to examine whether the commercial improved the university’s image. The data are as follows:

 

Person

X1 (before)

X2 (after)

 

A

15

15

 

B

11

13

 

C

10

18

 

D

11

12

 

E

14

16

 

F

10

10

 

G

11

19

 

H

10

20

 

I

12

13

 

J

15

18