The Essentials of Biostatistics for Physicians, Nurses, and Clinicians

156 CHAPTER 9 Nonparametric Methods

Table 9.7
Temperature Comparisons between Two Cities

Day Washington mean
temperature ( ° F)

New York mean

temperature ( ° F)

Paired

difference

Sign

1. January 15 31 38 − 7 –


2. February 15 35 33 2 +


3. March 15 40 37 3 +


4. April 15 52 45 7 +


5. May 15 70 68 2 +


6. June 15 76 74 2 +


7. July 15 93 89 4 +


8. August 15 90 85 5 +


9. September 15 74 69 5 +


10. October 15 55 51 4 +


11. November 15 32 27 5 +


12. December 15 26 24 2 +

Table 9.8
Aggressiveness Scores for 12 Sets of Identical Twins Based on
Birth Order

Twin
set

1st born

aggressiveness score

2nd born

aggressiveness score

Paired

difference

Sign of paired

difference

1 8 5 8 8 − 3 –
2 7 1 7 8 − 7 –

3 7 9 7 5 4 +
4 6 9 6 4 5 +
5 9 2 9 6 − 4 –
6 72 72 0 0
7 7 9 6 4 1 5 +
8 9 1 8 9 2 +
9 7 0 6 2 8 +
10 71 80 − 9 –
1 1 8 9 7 9 1 0 +
12 87 75 12 +