Teachers are being trained to standardize the scores they give to students' essays. The same essay was scored by 10 different teachers at the beginning and at the end of their training. The results are shown in the tables. Scores for Essay at Beginning of Teachers' Training 81 68 78 94 68 85 16 Scores for Essay at End of Teachers' Training 81 83 77 85 81 81 79 83 Calculate the MADS for the teachers' scores. Did the teachers make progress in standardizing their scores? (select) the MAD before the training was and the MAD at the end of the training is so (select) was made toward standardizing test scores.

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Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.