7. Using the information in the following table for three levels of a factor, determine if there is any significant difference in the data for a = 0.05. If significance occurs, determine the appropriate levels using the t reference distribution.

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Level Data 1 12 14 13 14 15 13 2 17 16 16 15 14 15 15 3 11 9 10 12 11 7 11 9