Abstract
The variation judgment problem of sample proportion is a task that requires us to compare the size of one sample with that of another sample. This problem can be solved by applying the law of large numbers. Although two sample sizes were different, the misjudgment that two variables were the same was often made. The tendency not to consider sample size and apply the law of large numbers was called “Insensitivity to sample size”. The author hypothesized that the factor of the misjudgment lied in the fact that the learners could not operate the law of large numbers to apply the variation judgment problem. In this research, university students carried out the operational simulation to change the law of large numbers to its reverse proposition. In the result, many subjects changed to proper judgments. In addition, the respondents cited the law of large numbers greatly increased. It was suggested that the operational simulation facilitated learners to verify the variation judgment of sample proportion
