2 A group of 10 employees at a factory were given a number (x) of training sessions. They were then asked to complete a task. The times taken to complete this task (y) were recorded, measured in minutes. The results are shown in the table. Number of 3 4 5 3 7 7 8 998 sessions (x) Time taken 10 15 14 12 7 12 6 56 4 (y min) a Find the correlation coefficient, r. b Comment on the relationship between the number of training sessions and the time taken to complete the task. c Find the equation of the regression line of y on x. d Hence estimate how long it would take an employee to complete the task if hey were given six training sessions.

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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.