Checkmarks the results may not be generalizable if

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checkmarks, the results may not be generalizable if they only apply to certain times/places/subjects/scale. ####Q4 **4a** The half of the class assigned to go to lecture/section and read the textbook is the treatment group (Group1). The other half of the class only assigned to read the textbook is the control group (Group2). **4b** The independent variable is going to lecture and section. The dependent variable is the test scores. **4c** Some factors I would be controlling include: * one class and section time * one professor and equally informed TAs * one test for the entire class * the same textbook for the entire class **4d**
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Because going to lecture and section (the independent variable) vastly improved the test scores (dependent variable) for Group1, we can infere that there is a correlation bettwen going to lection/section and improved test scores. The results also have internal validity because of the randomized groups; thus, we can infere a causal relationship between going to lecture/section and test scores. **4e** The original results aren't generalizable to other types of schooling. The original results aren't externally valid because factors affecting classes with online lectures versus physical lectures/section are too different. ####Q5 Assuming that there is a (positive or negative) correlation between income and level of education, there are some factors that lead to endogeneity: * different fields of study/work * job market * location and cost of living * ethnicity/sexual orientation discrimination ###Part 2: Bias in Self-reported Turnout Surveys are frequently used to measure political behavior such as voter turnout, but some researchers are concerned about the accuracy of self-reported turnout (that is, whether people tell the truth when you ask them if they voted). In particular, they worry about possible social desirability bias where in post- election surveys--the fact that respondents who did not vote in an election lie because they may feel that they should have voted. Is such a bias present in the
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