Which statement describing this experiment is true? An experiment is proposed to measure the effectiveness of a brand of sunscreen. Adult volunteers O The volunteers are the explanatory variables. are randomly assigned to one of two brands of sunscreen and asked to enjoy a normal day at the beach. Each volunteer is asked to report back to the administrators after two hours, at which time both arms are assessed for sun exposure. O The brands of sunscreen are the response variables. O The amount of time in the sun is the response variable. O The brands of sunscreen are the explanatory variables.

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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.