9. A survey on a sample of persons who played at least one of the video games P, Q and R yielded the following data: 33 persons played P 40 persons played Q 36 persons played R 7 persons played P and R only 4 persons played P and Q only 12 persons played Q and R only 15 persons played Q only. (a) Use x to represent the number of persons who played all three video games. Draw a carefully labelled Venn diagram to represent the data given. (b) Determine the value of x. (c) Calculate the number of persons in the sample.

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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.