A researcher gathered from historical papers that the proportion for the success of an event was between 40% to 60%. When calculating "n" the sample size needed for a given margin of error what should...

Extracted text: A researcher gathered from historical papers that the proportion for the success of an event was between 40% to 60%. When calculating "n" the sample size needed for a given margin of error what should the researcher use for p-hat to arrive at the most conservative (highest) sample size. A. .40 b. .25 C. .60 d. .50