From a large class, a sample of 4 grades were drawn: 64, 66, 78, and 87. from a second large class, an independent sample of 3 grades were drawn: 59, 78, and 93. test if the two class have equivalent performance in the test using the following methodology, assume 5% level of significance. you may make necessary assumptions.
a. Classical method.
b. P-value
c. Confidence interval.
d. Repeat but test if the first class performs better than the second.