Based on the information regarding the population, the conclusion that can be drawn is D. The standard deviation is large.
It should be noted that in sampling, the population simply means the entire group that one wants to draw conclusions about.
From the information given, the Professor can conclude between the groups and find the difference with respect to cognitive processing.
In this case, the conclusion achieve isn't significant and can't be credited to the modification in the variable.
Hence, the conclusion that can be drawn is that the standard deviation is large.
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