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1. Is there a significant difference in the average midterm grade, at the 5% level, between the classes that meet on M/W/F and those that meet on T/R? Yes or No.
The classes that meet on M/W/F are classes 1 and 3. Those that meet on T/Thr are class 2.
YES; From the table 1 above, there is a significant difference between the classes that meet on M/W/F and those that meet on T/R.
Class 3 is different from class 2 and class3 is different from class 1. Class 3 and class 1 are not significant in terms of midterm tests.
2. If there is a significant difference, then tell which group has higher midterm scores on average and tell how much better the group does (with 95% confidence).
Class 3 has a high average midterm scores (mean difference of -21.3 and -1.2 higher than class 2 and 1 respectively.)
Null: H0: μ1 = μ2 = μ3, all the means are the same...
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