In a recent survey, consumers were asked where they did their gift shopping. The following results were obtained:  621 shopped at Macy's, 513 shopped at Emporium, 367 shopped at Nordstrom, 723 shopped at Emporium, or Nordstrom, 749 shopped at Macy's or Nordstrom, 157 shopped at all three, 96 shopped at neither Macy's nor Emporium nor Nordstrom. a. What percent of the consumers shopped at more than one store? b. What percent of the consumers shopped exclusively at Nordstrom?

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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.