It has been hypothesized that treatments (after casting) of a plastic used in optic lenses will improve wear. Four different treatments are to be tested. To determine whether any differences in mean wear exist among treatments, 28 casting from a single formulation of the plastic were made and 7 castings were randomly assigned to each of the treatments. Wear was determined by measuring the increase in “haze” after 200 cycles of abrasion (better wear being indicated by smaller increases). The data collected are reported in the accompanying table. Treatment A B C D 9.16 11.95 11.47 11.35 13.29 15.15 9.54 8.73 12.07 14.75 11.26 10 11.97 14.79 13.66 9.75 13.31 15.48 11.18 11.71 12.32 13.47 15.03 12.45 11.78 13.06 14.86 12.38 Q. Construct ANOVA table. At the 5%, is there evidence of significant difference in mean wear among the four treatments? Determine which treatments differ in average wear.
It has been hypothesized that treatments (after casting) of a plastic used in optic lenses will improve wear. Four different treatments are to be tested. To determine whether any differences in
|
Treatment |
|||
|
A |
B |
C |
D |
|
9.16 |
11.95 |
11.47 |
11.35 |
|
13.29 |
15.15 |
9.54 |
8.73 |
|
12.07 |
14.75 |
11.26 |
10 |
|
11.97 |
14.79 |
13.66 |
9.75 |
|
13.31 |
15.48 |
11.18 |
11.71 |
|
12.32 |
13.47 |
15.03 |
12.45 |
|
11.78 |
13.06 |
14.86 |
12.38 |
Q. Construct ANOVA table. At the 5%, is there evidence of significant difference in mean wear among the four treatments? Determine which treatments differ in average wear.
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