1) Estimation of MEAN: JoAnne spends her summers proof-reading mystery novels for a publishing company. She gets paid by the page. She was asked what the average sized mystery novel is. She said that...

1) Estimation of MEAN:   JoAnne spends her summers proof-reading mystery novels for a publishing company. She gets paid by the page. She was asked what the average sized mystery novel is. She said that she has worked on 25 of them, and the mean was 325 pages, s= 40.

Using a 95% Confid. Level, what is the average number of pages for all mystery novels?

Margin of error __________

                            ___________<  µ="">< >