ECON 2500 Study Guide - Standard Deviation, Box Plot, Sampling Distribution

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ECON 2500 Full Course Notes
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ECON 2500 Full Course Notes
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A stemplot of a set of data is roughly symmetric, but the data do not even approximately follow the 68-95-99. 7 rule. Not enough information to determine whether it is standard normal. A high school guidance counselor wants to study the later earnings of the class of 1990. The high school had 800 graduates in the class of 1990; among them, 400 obtained college degrees and the other 400 did not. In the year 2000, the counselor randomly selects 20 individuals from among those who obtained college degrees, and another 20 individuals among those who didn"t obtain college degrees. Earnings data is collected on these 40 selected individuals. A designed experiment, in which the treatment group receives a college degree, and the control group gets no college degree. Based on anecdotal evidence , and hence is not reliable. An observational study, in which the 40 selected individuals are a simple random. However, the 40 selected individuals are not a simple random.

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