A researcher wants to survey nurses who work at Sacred Heart hospital. Of the 90 nurses who work at this hospital, 40 work in the maternity ward, 20 work in the oncology ward and 30 work in the surgical ward. You decide to study 10% of the nurse population so you choose nine nurses as follows: 4 nurses are chosen at random from the 40 maternity nurses, two are chosen at random from the 20 oncology nurses, and 3 are chosen at random from the 30 surgical nurses. What type of sampling is this?

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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.