Question: 6. Using the data from the previous two exercises, compare the 20% trimmed means of the experimental group to the control, taking into account grade.

6. Using the data from the previous two exercises, compare the 20% trimmed means of the experimental group to the control, taking into account grade. Also test for no interactions using lincon and linconb. Is there reason to suspect that the confidence interval returned by linconbt will be longer than the confidence interval returned by lincon?

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