Note: If the sample size is determined before the sample is selected, the p* and q* in the above equation are our best guesses. In other words, if p* = 0.5 is used, then you are guaranteed that the ma...Note: If the sample size is determined before the sample is selected, the p* and q* in the above equation are our best guesses. In other words, if p* = 0.5 is used, then you are guaranteed that the margin of error will not exceed E but you also will have to sample the largest possible sample size. If you have a prior knowledge about the sample proportion then you may not have to sample as many people to get the same margin of error.
Note: If the sample size is determined before the sample is selected, the p* and q* in the above equation are our best guesses. In other words, if p* = 0.5 is used, then you are guaranteed that the ma...Note: If the sample size is determined before the sample is selected, the p* and q* in the above equation are our best guesses. In other words, if p* = 0.5 is used, then you are guaranteed that the margin of error will not exceed E but you also will have to sample the largest possible sample size. If you have a prior knowledge about the sample proportion then you may not have to sample as many people to get the same margin of error.
