Source of variation 
SS 
df 
MS 
F 
Between groups 
7.18 
3 
2.39 
21.73 
Within groups 
48.07 
453 
0.11 

Total 
55.25 
456 
(a)
Number of treatments = k = 3 + 1 = 4
(b)
Total sample size = N = 456 + 1 = 457
(c)
For = 0.05,& Degrees of Freedom of numerator = 3 & Degrees of Freedom of denominator = 453, from Table:
Critical Value of F = 2.625
(d)
H0: Null Hypothesis:
HA: Alternative Hypothesis: (At least one mean is different from other 3 means)
(e) Since calculated value of F = 21.73is greater than critical value of F = 2.625, the difference is significant. Reject null hypothesis.
(f)
We can conclude that any of the treatment means differ.
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