Highway paving Inc. is a company specializing in residential road surfacing. Many of its clients seek out its specialized products. Recycled rubber can be added to asphalt mixture to reduce road noise which appeals to environmentally conscious clients. However the viscosity (resistance of flow) must be maintained within very tight limits otherwise it may be too thick or too watery. The goal is a viscosity of 3200. During the manufacturing of each batch of asphalt, the quality control specialists takes 15 samples of the material and tests the viscosity. This also ensures the batch has uniform viscosity. Calculate σx̅. Specimen Viscosity Specimen Viscosity 1 3193 8 2979 2 3124 9 3182 3 3153 10 3227 4 3145 11 3256 5 3093 12 3332 6 3466 13 3204 7 3355 14 3282     15 3170

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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.