Consider the data with analysis shown in the following computer output:
Level N

Mean StDev

A 4 10.400 2.473

B 5 16.800 2.168

C 6 10.800 2.387

Source DF SS MS F P

Groups 2 130.54 65.27 10.74 0.002

Error 12 72.96 6.08

Total 14 203.50

Is there sufficient evidence of a difference in the population means of the three groups?

yes

or

no

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