Calculating sample sizes are time-consuming when done on a calculator. Fortunately, there are good power analysis programs that will calculate both sample size and power. Dr. Len Thomas maintains a website with information on all available power analysis and sample size programs. The M.D. Anderson Cancer Center at the University of Texas maintains a web site with a variety of downloadable statistical programs. The programs are listed alphabetically.
Information is either on-line or downloadable.
There are also case studies and additional references. There is also a downloadable user's manual. Clicking on other options will lead you to explanations of concepts, case studies, or interactive programs that will help with the design of a monitoring program.