Chapter 16.5, Problem 24E

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. The time in minutes until the paint was dry enough for a second coat to be applied was recorded for each sample. The data obtained follow.

Paint 1	Paint 2	Paint 3	Paint 4
128	144	133	150
137	133	143	1 42
135	142	137	135
124	146	136	1 40
141	130	131	153

1. a. Use α = .05 to test for any significant differences in mean drying time among the paints.
2. b. What is your estimate of the mean drying time for paint 2? How is it obtained from the computer output?