Corrosion of metals is a problem in many mechanical devices. Three sealants used to help retard the corrosion of metals were tested to see whether there were any differences among them. Samples from ten different ingots of the same metal composition were treated with each of the three sealants, and the amount of corrosion was measured after exposure to the same environmental conditions for 1 month. The data are given in the accompanying table. Is there any evidence of a difference in the abilities of the sealants to prevent corrosion? Test usingα = .05.
Sealant
|
Ingot
|
I
|
II
|
III
|
|
1
|
4.6
|
42
|
4.9
|
|
2
|
7.2
|
6.4
|
7.0
|
|
3
|
3.4
|
3.5
|
3.4
|
|
4
|
6.2
|
5.3
|
5.9
|
|
5
|
8.4
|
6.8
|
7.8
|
|
6
|
5.6
|
4.8
|
5.7
|
|
7
|
3.7
|
3.7
|
4.1
|
|
8
|
6.1
|
6.2
|
6.4
|
|
9
|
4.9
|
4.1
|
4.2
|
|
10
|
5.2
|
5.0
|
5.1
|