Company A recently developed an epoxy painting process for corrosion protection on exhaust components. Mr.Y, the owner, wishes to determine whether the lengths of life for the paint are equal for…

Company A recently developed an epoxy painting process for corrosion protection on exhaust components. Mr.Y, the owner, wishes to determine whether the lengths of life for the paint are equal for three different conditions: saltwater, fresh-water without weeds, and freshwater with a heavy concentration of weeds. Accelerated-life tests were conducted in the laboratory, and the number of hours the paint lasted before peeling was recorded.

Condition
Value 1
Value 2
Value 3
Value 4
Value 5
Saltwater
167.4
189.6
177.2
168.4
180.3
Freshwater without weeds
160.5
177.6
185.3
170.9
176.6
Fresh water with weeds
180.7
164.4
172.9
169.2
170.7

Use the Kruskal-Wallis test at 0.01 level of significance to determine whether the lasting quality of the paint is same for the three water conditions.

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