QUESTION 1 For a two sample E-test, what other additional factors must be considered? 2 2 0 Use pooled variance sp when 012 a5 02 0 Use pooled variance 3.32 when 012 = 022 'u' Use Satterthwaite's approximation when 012 = 022 U None of these options QUESTION 2 Suppose we are testing for the difference between the means of 2 independent populations assuming the equal variances. The sample sizes are n1 : 20 and n2 = 30, the degrees of freedom is equal to O 48 O 39 O Sauerlhwaite's approximation and round down 0 18 QUESTION 3 To test the effectiveness of a certain course offered online. 8 students took a test before starting and after completing the course. The results are given below. Student Exam score (Before) Exam score (after) 1 530 670 2 690 770 3 910 1000 4 7'00 7'10 5 450 550 6 320 370 7 820 7'70 8 630 610 The value of the standard error of the difference scores is 0 14.696 0 55.027 0 22.991 0 60.828