Mr. Gotcha administers a "lie detection" test to a population of job applicants. He correctly states that, on average, his test is correct 80% of the time. The table below has to do with his study. ACTUAL Liar Truth teller Liar 160 TEST RESULT Truth teller 640 200 800 1,000 What is the base rate of lying in the population he is studying? 40/1000 = 4% 160/1000 = 16%

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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.