xplain your choice. this statistic is biased, but it has a much lower standard deviation than the other two. this statistic is unbiased and has the smallest standard deviation of the three. the standard deviation of this statistic isn't the lowest, but it is the only unbiased statistic out of the three. the standard deviation of this statistic isn't the highest, but it is the only unbiased statistic out of the three. this statistic is biased, but it has a much higher standard deviation than the other two. this statistic is unbiased and has the largest standard deviation of the three.