MY QUESTION IS #11 not 8,9.!! The following applies to Questions 8 - 11 . The mi

Question

MY QUESTION IS #11 not 8,9.!!

The following applies to Questions 8 - 11.

The midterm scores for samples of students from two sections of a large course have the following summary statistics:

Question 8 (1 point)

A 99% confidence interval for the difference in the true mean midterm scores of Section A01 and A02 students is calculated. Which of the following provides a correct interpretation of this interval?

Question 8 options:

A)

The probability that 1 - 2 lies in the calculated interval is 0.99.

B)

In repeated samples of 10 A01 students and 8 A02 students, 99% of similarly constructed intervals will contain the difference in sample mean midterm scores.

C)

In repeated samples of 10 A01 students and 8 A02 students, 99% of similarly constructed intervals will contain the difference in true mean midterm scores of A01 students and A02 students.

D)Approximately 99% of samples of 10 students from A01 and 8 students from A02 will have a difference in midterm scores between the endpoints of the calculated confidence interval.

Question 9. We would like to conduct a hypothesis test at the 1% level of significance to determine whether the true mean midterm score for Section A02 students is higher than the true mean midterm score for Section A01 students. What are the hypotheses for the appropriate test of significance?

Question 9 options:

A)

H0:XA02=XA01 vs. Ha: XA02>XA01H0:XA02=XA01 vs. Ha: XA02>XA01

B)

H0:XA02=XA01 vs. Ha: XA02XA01H0:XA02=XA01 vs. Ha: XA02XA01

C)

H0:A02=A01 vs. Ha: A02>A01H0:A02=A01 vs. Ha: A02>A01

D) H0:A02=A01 vs. Ha: A02A01

QUESTION 11) If we have the calculated confidence interval in Question 8, could it be used to conduct the hypothesis test in Question 9?

Question 11 options:

Yes

No

# of Students Mean Standard Deviation Section A01 10 64.6 20.20 Section A02 8 71.0 11.27

Explanation / Answer

Ans:

8)Option C is correct.

In repeated samples of 10 A01 students and 8 A02 students, 99% of similarly constructed intervals will contain the difference in true mean midterm scores of A01 students and A02 students.

9)Option C is correct.

H0:A02=A01 vs. Ha: A02>A01

11)Yes(depending on the range of confidence interval,we can give conclusion about whether A02 students score higher or not i.e. if CI have both limits +ve)

H0:A02=A01 vs. Ha: A02>A01

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