7. Voter registration records show 68% of all voters in Indianapolis are registered as Republicans. A ran- dom digit dialing device is used to call 150 randomly chosen residential homes in Indianapolis. Of the 150 registered voters who are contacted, 73% are registered Republicans. Should you suspect the ran- dom digit dialing device of favoring phone numbers of Republicans?

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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.