The statistic textbook has 500 pages. Assume that students start to read at page 1 and continue as time allows. The distribution of pages completed by students in my class is normally distributed with a mean of 150 pages and a standard deviation of 30. I've asked Einar to prepare material for the 32% of the students who have read the least, Sunho will prepare for the next 43% and Sabrina will prepare a conference for the next 24% of those who have read the most. Until what page should each TA prepare? (We're not preparing for the top 1% of students!)
2006-11-27 14:39:40 · 2 answers · asked by Anonymous in Education & Reference ➔ Higher Education (University +)
1. Using your Normal Distribution table (sorry, mine is buried under my dirty laundry), find the Std Devs that represents .18 (.50 - .32). Multiply by 30 (Std Dev). This number represents the number of pages short of 150 (the mean). It's probably around 140.
2. The second group (.18 below 150 pages + .25 above 150). Repeat the process for 1 above. (about 140 to 165)
3. The third group is from .25 to .49 above the mean (about 165 to 240)
Good luck.
2006-11-27 22:18:08 · answer #1 · answered by SPLATT 7 · 1⤊ 0⤋
Maximum 240 pages with confident level 99.8 %
2006-12-01 12:26:38 · answer #2 · answered by JAMES 4 · 0⤊ 0⤋