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MATH 225N WEEK 6 QUIZ STATISTICS – QUESTION
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MATH 225N WEEK 6 QUIZ STATISTICS – QUESTION Question 1 A statistics professor recently graded final exams for students in her introductory statistics course. In a review of her grading, she found the mean score out of 100 points was a x¯=77, with a margin of error of 10. Construct a co...

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  • March 25, 2024
  • 13
  • 2023/2024
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AND ANSWERSMATH 225N WEEK 6 QUIZ STATISTICS – QUESTION
Question 1
A statistics professor recently graded final exams for students in her introductory statistics course. In a review of her grading, she found the mean score out
of 100 points was a x¯=77, with a margin of error of 10.
Construct a confidence interval for the mean score (out of 100 points)
on the final exam.
Answer: (67, 87)
Question 2
A random sample of adults were asked whether they prefer reading an e- book over a printed book. The survey resulted in a sample proportion of p
′=0.14, with a sampling standard deviation of σp′=0.02, who preferred
reading an e-book.
Use the empirical rule to construct a 95% confidence interval for the true proportion of adults who prefer e-books.
Answer: ( 0.10, 0.18)
Question 3
The pages per book in a library are normally distributed with an unknown population mean. A random sample of books is taken and results in
a 95% confidence interval of (237,293) pages.
What is the correct interpretation of the 95% confidence interval?

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