# Matched Pairs

5 Questions

QUESTION 1 of 5

Hiii Professor

I was wondering if you could tell me why in question #32 in chapter 9 are the signs not equal? I don't know if I'm reading it wrong, or maybe I'm not understanding

QUESTION 2 of 5

Hi Professor, on 9.7 number 31 on the homework why was the claim: MD>0? i do not understand why that was the claim for it and how do you figure out the claim in general for 9.7? i did not quit understand that concept for finding that claim in that section. for example how do u know if its MD>0 or MD

QUESTION 3 of 5

Hello Professor disregard the question I just asked " in the homework section 9.8 problem 35 I am not getting the right numbers for the interval. My critical value is 3.106 and the test stat comes out to be 3.16. What am I doing wrong?" my critical value was incorrect now I have the interval [-3.24, 1.24].

QUESTION 4 of 5

Hello, Mr. McGuckian. For the homework problems in 9.8 (#35 and 36), I am getting he correct answer but the wrong sign. For example for #36, the answer is (1.21, 7.54). But I got (-1.21, -7.54). I was wondering why this was.
Thanks.

QUESTION 5 of 5

Hi professor
I am confused with the results of #36 on the hw. The confidence interval came out to be 1.21 and 7.54. So the results are that there is a significant difference because they are both positive. However, since both are positive results, doesn't that mean that the first mean is bigger. And according to the problem, the 1st mean is the 1st score before retaking the exam. However, the results show that the students get a better score after retaking the exam (which is the 2nd mean in the problem). Can you please explain the results.

Thank you