,
, MATH 225 WEEK 6 TEST | QUESTIONS
AND ANSWERS | 2026 UPDATE - GRADE
100% | WITH COMPLETE SOLUTIONS.
SECTION 1: CONFIDENCE INTERVALS FOR MEANS
(Questions 1-10)
Question 1
A statistics professor recently graded final exams and found the mean score
was x̄=77, with a margin of error of 10. Construct a confidence interval for
the mean score on the final exam.
A) (67, 87)
B) (77, 87)
C) (67, 77)
D) (10, 77)
Answer: A) (67, 87)
Rationale: A confidence interval is centered on a point estimate in the form
(point estimate − margin of error, point estimate + margin of error). Using
x̄=77 and margin of error 10: (77−10, 77+10) = (67, 87).
Section: Confidence Intervals
Source: MATH 225N Week 6 Quiz
Question 2
The pages per book in a library are normally distributed with an unknown
, MATH 225 WEEK 6 TEST | QUESTIONS
AND ANSWERS | 2026 UPDATE - GRADE
100% | WITH COMPLETE SOLUTIONS.
SECTION 1: CONFIDENCE INTERVALS FOR MEANS
(Questions 1-10)
Question 1
A statistics professor recently graded final exams and found the mean score
was x̄=77, with a margin of error of 10. Construct a confidence interval for
the mean score on the final exam.
A) (67, 87)
B) (77, 87)
C) (67, 77)
D) (10, 77)
Answer: A) (67, 87)
Rationale: A confidence interval is centered on a point estimate in the form
(point estimate − margin of error, point estimate + margin of error). Using
x̄=77 and margin of error 10: (77−10, 77+10) = (67, 87).
Section: Confidence Intervals
Source: MATH 225N Week 6 Quiz
Question 2
The pages per book in a library are normally distributed with an unknown