3. Two formulations of a certain coating, designed to inhibit corrosion, are being tested. For each of eight pipes, half the pipe is coated with formulation A and the other half is coated with...

3. Two formulations of a certain coating, designed to inhibit corrosion, are being tested. For each of eight pipes, half the pipe is coated with formulation A and the other half is coated with formulation B. Each pipe is exposed to a salt environment for 500 hours. Afterward, the corrosion loss (in µm) is measured for each formulation on each pipe.

Pipe A: 197 161 144 162 185 154 136 130
Pipe B: 204 182 140 178 183 163 156 143

Can we conclude that the mean amount of corrosion differs between the two formulations? Use a 0.01 level of significance.