Four different paints are advertised as having the same drying time. To check the manufacturers claims, five samples were tested for each of the paints.

Four different paints are advertised as having the same drying time. To check the manufacturer’s claims, five samples were tested for each of the paints. The time in minutes until the paint was dry enough for a second coat to be applied was recorded. The following data were obtained.

At the α = .05 level of significance, test to see whether the mean drying time is the same for each type ofpaint.

Paint 2 144 133 142 146 130 Paint 3 133 137 Paint 4 150 142 135 140 153 Paint 1 128 137 136