The staff of a school newspaper plans to investigatestudents’ opinions regarding the school’s security guards.They decide to survey 100 students at the school. Theeditor-in-chief recommends that they survey 25 randomlyselected students from each class (freshmen, sophomores,juniors, seniors). This is an example of aA) blocked random sample.B) multi-stage random sample.C) simple random sample.D) stratified random sample.E) random cluster 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.