A supervisor wishes to determine whether the mean times required to complete a certain task
differ for the three levels of worker training. She randomly selected 10 students with each of the
three levels of training (Beginner, Intermediate and Advanced). The data are summarized in
Table 1.
Do the data provide sufficient evidence to indicate that the mean times required to complete a
certain task significantly differ for at least two of the three levels of training? Complete the
ANOVA output table (Table 2) to answer the question. (8pts)
Table 1 Summary of data
Level of Training
Advanced
Intermediate
Beginner n
10
10
10 M
24.2
27.1
30.2 s2
21.54
18.64
17.76 Table 2 ANOVA summary table
Source
Treatments (between)
Error (Within)
Total SS
702.53 df MS
90.03 F

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