Question 1 - Four different paints are advertised as having the same drying time. To check the manufacturing'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.
|
Paint 1
|
Paint 2
|
Paint 3
|
Paint 4
|
|
128
|
144
|
133
|
150
|
|
137
|
133
|
143
|
142
|
|
135
|
142
|
137
|
135
|
|
124
|
146
|
136
|
140
|
|
141
|
130
|
131
|
153
|
At the α = .05 level of significance, test to see whether the mean drying time is the same for each type of paint.
Question 2 - In a study conducted to investing browsing activity by shoppers, each shopper was initially classified as a nonbrowser, light browser, or heavy browser. For each shopper, the study obtained a measure to determine how comfortable the shopper was in a store. Higher scores indicated greater comfort. Suppose the following data were collected.
|
Nonbrowser
|
Light Browser
|
Heavy Browser
|
|
4
|
5
|
5
|
|
5
|
6
|
7
|
|
6
|
5
|
5
|
|
3
|
4
|
7
|
|
3
|
7
|
4
|
|
4
|
4
|
6
|
|
5
|
6
|
5
|
|
4
|
5
|
7
|
a. Use α = .05 to test for differences among comfort levels for the three type of browsers.
b. Use Fisher's LSD procedure to compare the comfort levels of nonbrowsers and light browsers. Use α = .05. What is your conclusion?