1. Four different paints are advertised as having the same drying time. In order to check the manufacturers' claims, five paint samples were tested for each make of paint. The time in minutes until the paint was dry enough for a second coat to be applied was measured. The following data were obtained.

Paint 1 Paint 2 Paint 3 Paint 4

128 144 133 153

137 133 143 150

135 142 137 153

124 146 136 142

141 130 131 150

At the a = 0.05 level of significance, test to see if the mean drying time is the same for each type of paint.