Four different statistics have been proposed as estimators of a population parameter. To investigate The behavior of these estimators, 500 random samples are selected from a known population and it statistic is calculated for each sample. The true value of the population parameter is 75. the graphs below show the distribution of values for each statistic. A. Which of the statistics appear to be unbiased estimators of the population parameter? How can you tell?

B. Which of the statistics a or B would be better estimate or of the population parameter? Explain your choice.

C. Which of the statistics of your day would be better estimator of the population parameter? Explain your choice.