Data Collection and Statistics Sample Size Calculation The primary objective of the study is to compare the efficacy, tolerability and safety of the standard bowel preparation Golytely with a novel bowel preparation agent Miralax. The study is a non-inferiority study: The objective is to conclude that the prep quality scores of those receiving Miralax is at most 10% less than for Golytely. Thus the difference in prep scores between Miralax minus Golytely should be greater than - 10%. If this is the case, Miralax would be considered as non-inferior to Golytely. To calculate sample size we performed a one-sided test based on the binomial distribution with the intent of demonstrating that Miralax is non-inferior if the calculated one-sided p-value is less than 0.05. If the true difference between the Miralax and Golytely is exactly 0%, then the test should give a p-value less than 0.05 with a probability of 0.80. Since we want to conclude that the difference in responders, Miralax minus Golytely, is greater than - 10%, we choose as the null hypothesis H0: the true difference in proportions is less than or equal to - 0.10 and the alternative hypothesis H1: the true difference in proportions is greater than - 0.10. Based on the study by Lai and others (24), on a 0-9 scale the expected mean prep score with Golytely will be 6.2 with a standard deviation of 1.5.