Parameters are: A) numerical characteristics of a sample. B).numericalcharacteristics of a population. C)the averages taken from a sample. D)numericalcharacteristics of either a sample or a population.2.(A)If the expected value of a sample statistic is equal to the parameter it is estimating,then we call that samplestatistic: (A) unbiased (B) minimum variance (C) biased (D) random.