ECON 3210 Lecture 9: Econ 3210 Lecture 9
7 Jan 2018
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Document Summary
Project star uses the sample of students to perform a randomized trial. Random assignment means that from our sample, project star randomly selected a subset of the sample and put them into small class sizes. This random assignment is critical: the students selected were not selected based on any of their characteristics, and each and every student had the same possibility of being assigned to any class size. All of the sudden class size is unrelated to parental help, student behavior, etc. (basically, all other determinants of student test scores that are in ui) Random assignment implies that the two groups will only differ, on average, in terms of class size and the consequences that follow from it; they are otherwise identical (on average). Two randomly chosen groups are comparable, when sample sizes are large enough. The average in the population is a fixed number, or parameter, called the expectation or the mathematical expectation.
