Triangle JKL is formed by plotting three points, as shown below. What is the length of side
JK?
у
6
KIL
3
10
9
8
J (1.4) 7
K(1.9) 6
N
L(3, 9) 5
5
4
3
2
1
0
> X
0 1 2 3 4 5 6 7 8 9 10

Which of the following is the major negative aspect of crossover designs for research studies? a. prohibitive cost b. residual effects c-subject drepout d. incomplete randomization e. large sample size required