I'm reading this text and wanted to know how they calculated the 95% confidence interval when calculating sample size and what it means:
"The sample size is 150 so that for a response rate of 80% there is 80% power that the confidence limits between 71% and 89% cover the estimate of the ORR."
How is this calculated and how can I find the confidence interval for different sample sizes, e.g. 50 with response rate of 0.8 and 0.9. What formula is used?