Question: A hospital safety committee at a large medical center is wondering if an education program for the nurses, titled Patient Prevention, has decreased medication errors. They consult with the in-house researcher. The researcher randomly selects 350 incident reports and reviews the reports for medication errors. S/he finds a total of 75 incidents had medication errors. Does this imply that the program may have contributed to a change in the incidence of medication errors? The incidence of medication errors is known to be 15 percent in the population of large medical centers in the US.

(Careful – note how the medication errors are reported in this problem and what you need in the formula….)