Hey I need to calculate the sample Size needed for a 95% CI for this problem. I am trying to help my brother with his homework but I have not taken Stats for like 3 years. So any help would be great!
A bank manager wants to determine the percent of the time his tellers are working and idle. He decides to use work sampling, and his initial estimate is that the tellers are idle for 20% of the time. Approximately how many observations should be taken to be 95% confident that the results will not be more than 5% away from the true results?
I got a result of 62, but that’s not one of the options.
Thanks in advance!
2007-10-16 18:07:39 · 3 answers · asked by AllStar 2 in Education & Reference ➔ Homework Help
Try the sample size calculator from www.surveysystem.com/sscalc.htm
Or, download the lectures from
courses.dsu.edu/bus476/lecture_notes/Chapter 17.ppt
www.ssc.wisc.edu/~logan/360/Ch19_4up.pdf
Hope this helps ^_^
2007-10-16 18:50:43 · answer #1 · answered by redskibaby 2 · 0⤊ 0⤋
Don't you have a teacher or tutor in statistics that could help you? They could explain it much easier in person than using yahoo.answers wish you good luck...
2007-10-16 18:59:43 · answer #2 · answered by bobbie e 3 · 0⤊ 0⤋
If you use a binomial distribution, there are charts and figures available which can do that for you.
2007-10-16 18:12:08 · answer #3 · answered by cattbarf 7 · 0⤊ 0⤋