PATH 5121 - BIOSTATISTICS

Exercise 8 - Solution

 

 

1. The following data give brain weights and medullary pyramid fiber counts for eleven cerebral palsy patients.

 

Patient Brain weight Large fiber count

1 515 32,500

2 286 26,800

3 469 11,400

4 410 14,850

5 461 23,640

6 436 23,820

7 479 29,840

8 198 21,830

9 389 24,650

10 262 22,500

11 536 26 000

 

Estimate the correlation between brain weight and large fiber count. Test the hypothesis that the population correlation coefficient is zero.

 

 

r=0.1603

 

H0: r=0

HA: r0

 

a=0.05 df=11-2=9 tcr=2.262

 

Accept H0