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Chapter 16: One-Way Analysis of Variance
733
determine whether there was a significant difference between the average
times for complete relief of the headache using the 3 drugs, what will be the
F
critical value for the test?
Solution:
From the information given, then
= 3,
= 28, and
= 0.05.
Now, since the numerator degrees of freedom =
-1, then this value will be
3 – 1 = 2. Also, the denominator degrees of freedom =
–
, then this value
will be 28 – 3 = 25. We can use the
Critical
F
-Values
workbook to obtain
this value. From the workbook
F
2, 25, 0.05
= 3.3852.
The
F
Critical Values
workbook output is shown in
Figure 16-15
.
Figure 16-15:
Workbook Output with Critical
F
-Value
for
Example 16-10
Section Review
The following section illustrates how we can go about doing the test for
equality of means for a one-way ANOVA design. Both the classical and the
P
-value approach will be discussed.
16-6 One-Way or Single Factor ANOVA Test for Equality of
Several Population Means
e-Self Review Click here for the Critical F -Values Workbook