An experiment is conducted to investigate the toxic effect of three chemicals A,
ID: 3383299 • Letter: A
Question
An experiment is conducted to investigate the toxic effect of three chemicals A, B, and C, on the skin of rats. Three adjacent 1-inch squares are marked on the backs of eight rats, and each of three chemicals is applied to each rat, thus setting up a randomized block design. The squares of skin are then scored from 0 to 10, depending on the degree of irritation. The Excel Summary Output for the data and the partially completed ANOVA Table at = 0.01 is below.
SUMMARY
Count
Sum
Average
Variance
1
3
14
4.666666667
2.333333
2
3
21
7
7
3
3
18
6
9
4
3
19
6.333333333
2.333333
5
3
24
8
1
6
3
18
6
1
7
3
18
6
1
8
3
18
6
1
A
8
50
6.25
1.642857
B
8
57
7.125
2.125
C
8
43
5.375
4.267857
Calculate the overall sample mean for the data.
Complete the ANOVA Table for the Test
SUMMARY
Count
Sum
Average
Variance
1
3
14
4.666666667
2.333333
2
3
21
7
7
3
3
18
6
9
4
3
19
6.333333333
2.333333
5
3
24
8
1
6
3
18
6
1
7
3
18
6
1
8
3
18
6
1
A
8
50
6.25
1.642857
B
8
57
7.125
2.125
C
8
43
5.375
4.267857
Explanation / Answer
An experiment is conducted to investigate the toxic effect of three chemicals A,
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