7.4. Comparisons based on data from more than two processes
7.4.3. Are the means equal?
7.4.3.5. |
Confidence intervals for the difference of treatment means |
i-
j)
for the one-way ANOVA by continuing the
example shown on a previous page.
) 100%
confidence interval for the difference between two treatment
means is:
= MSE.
3 -
1
3 = 8.56
- 1 = 5.34
- t.025;12 = 2.179
2.179(0.763) or 3.22
1.616.
That is, the confidence interval is from 1.604 to 4.836.
3 -
2 is:
from -1.787 to 3.467.
A 95% confidence interval for
2 -
1 is:
from -0.247 to 5.007.
