APST 207 Lecture Notes - Lecture 2: Pew Research Center, Patient Protection And Affordable Care Act, Response Bias
Document Summary
Example 1 :we ask a random group of unr students who they support in an incoming super bowl. Sample, variable is the team, qualitative categories nominal , discrete, experimental units unr students. Example 2: what percentage of citizens in each state receive health insurance rebates under. Obamacare ? variable percentage of rebates quantitative, experimental units, ratio because in theory there could be, population. Example 3: pew survey on political ideology in u. s over time using random dialing of landline and cell phone numbers sample,variable political ideology, qualitative because categories, nominal. Reliability: the certainty in measurement-or the ability to replicate the results. Influenced by measurement error: differences between the actual value and observed value. Random: causes by unpredictable fluctuations in conditions or the accuracy of the measurement tool. Systematic: caused by a problem with the measurement tool. Example: random would be if you had shaky hands while measuring. Systematic measurement error : if the foot long rule has 11. 5 inches.
