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MATH 225N Week 6 Quiz

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  • Course
  • Math 225N (MATH225N)
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  • Chamberlain

1. Question: 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 p...

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  • November 11, 2019
  • 11
  • 2019/2020
  • Exam (elaborations)
  • Questions & answers

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  • math225nquiz
  • chamberlainmath225nquiz
  • math225nweek6
  • math225nweek6quiz
  • math225n

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  • Chamberlain
  • Mathematics
  • Math 225N (MATH225N)
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MATH 225N Week 6 Statistics Quiz

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.

That is correct!

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.


That is correct!

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?

That is correct!

We estimate with 95% confidence that the sample mean is between 237 and 293 pages.
We estimate that 95% of the time a book is selected, there will be between 237 and 293 pages.
We estimate with 95% confidence that the true population mean is between 237 and 293 pages.



Question 4

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