SOLUTION: An editor wants to estimate average the number of pages in bestselling novels, so that his estimate falls within 25 pages of the true average. Assuming that the standard deviation
Algebra.Com
Question 973108: An editor wants to estimate average the number of pages in bestselling novels, so that his estimate falls within 25 pages of the true average. Assuming that the standard deviation is 65 pages, how large a sample of bestselling novels is needed to achieve ( 15 points)
a) 99% confident
b) 95% confident
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
An editor wants to estimate average the number of pages in bestselling novels, so that his estimate falls within 25 pages of the true average. Assuming that the standard deviation is 65 pages, how large a sample of bestselling novels is needed to achieve ( 15 points)
a) 99% confident
n = [2.5758*65/25]^2 = 45 when rounded up
-----------------
b) 95% confident
n = [1.96*65/25]^2 = 26 when rounded up
--------------
Cheers,
Stan H.
--------------
RELATED QUESTIONS
An editor wishes to make a statement about the mean number of errors per page in a fifty... (answered by ikleyn)
John has 100 pages to read over 5 days. He wants to increase the number of pages he reads (answered by ewatrrr)
John wants to hire an editor to check his thesis paper. The editor charges a flat rate... (answered by harpazo)
A Computer manufacturer wants to estimate the mean number of defective microchips it... (answered by Boreal)
Science fiction novels average 240 pages in length. The average length of 14 randomly... (answered by stanbon)
Science fiction novels average 250 pages in length. The average length of 10 randomly... (answered by stanbon)
A travel agent wants to estimate the mean price of a flight from Boston to Denver. A... (answered by Theo)
Lenox is planning to read 3 books in 5 weeks. The average number of pages in each of the... (answered by checkley71)
A statistics professor wants to compare today’s students with those 25 years ago. All... (answered by Boreal)