Hi There are many freely available options for calculating CIs. . Epi info is a good software to use. In case you don't have it installed you can also use open Epi online Regards Dr Gurpreet Singh MBBS, MD, MIPHA Assistant Professor Clinical Tutor and Instructor Dept of Community Medicine Armed Forces Medical College Pune 411040 On 25 Aug 2015 22:27, "Anoop B" <[log in to unmask]> wrote: > Hi Margaret, > > Here is great book by Cummings. G (The new Statistics: Estimating for > better research) with a free software in excel to calculate CI's and all > other stuff: In fact, probably the best book in learning about CI's and how > to use them. > > > http://www.latrobe.edu.au/psy/research/cognitive-and-developmental-psychology/esci > > Hope it helps > Anoop > >