![]() ![]() The percentage reported for Candidate X in poll I It is a modified version of the VassarStats calculator for "The Significance of the Difference between Two Independent Proportions." The values you need to enter before clicking the "Calculate" button are This calculator will assess the significance of the difference between these two percentages. Suppose there are two separate polls, I and II, in which Candidate X gets 43% and 48%, respectively. (Recall that margin of error is inversely related to sample size.)Ĭalculator 3: Significance of the Difference between the Results of Two Separate Polls For example, with a reported margin of error of ± 4%, the lower and upper limits will be calculated using 4.49 and 3.51, respectively. If the reported margin of error is entered as an integer, the programming for Calculator 2 will assume it to be a rounded value and calculate the lower and upper limits of estimated sample size based on the reported margin of error ± 0.49 percentage points. In cases if this sort, Calculator 2 will estimate the size of the sample on the basis of two items of information that probably will be given in the report: the margin of error and the largest of the candidate percentages. It occasionally happens that the press report of a poll will give no indication of the size of the sample on which the poll is based. These upper and lower limits are precisely equidistant from theĮstimated population percentage only when that percentage isĬalculator 2: Estimating Sample Size when the Report of a Poll Fails to Provide that Essential Bit of Information The 'margin of error' reported here is calculated as one-half theĭistance between the upper limit and the lower limit. They also often appear to be based on the percentage for the candidate who has the majority or plurality within the sample. Note: For polls reported in the news media, the margins of error tend to be rounded to the nearest integer. This calculator will also work if the sample percentage for only one of the candidates is entered. Enter the respective percentages of respondents within the sample who favor Candidate X and Candidate Y into the top two cells enter the size of the sample into the third cell and then click the "Calculate" button. This calculator can be used for analyzing the results of a poll of your own (in which case, keep in mind the requirement of a representative sample) or for checking the preciseness of the results of polls reported in the news media. Significance of the Difference between the Results for Candidate X and Candidate Y in a Single PollĬalculator 1: Estimated Population Percentage and Margin of Error ![]() Significance of the Difference between the Results of Two Separate Polls ![]() If you don't want to rely on probability during your trips, our gas cost calculator is a perfect tool to plan it effectively.Estimated Population Percentage and Margin of ErrorĮstimating Sample Size when the Report of a Poll Fails to Provide that Essential Bit of Information
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