MATH 2P98 Lecture Notes - Lecture 1: Los Angeles Times, Houston Chronicle, Sine Wave
8 May 2016
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Math 2p98: applied statistics (spring 2016) - week 1. Example 1: corporal punishment by mothers and development of children"s cognitive ability: A longitudinal study of two nationally representative age cohorts. (straus, 2009) The researcher followed a sample of 806 kids who were between 2 and 4 years of age, measured their iq, and then measured their iq again four years later. At the end of the study, the kids were spanked were on average 5 iq points lower than the kids who were not spanked. If we want to discuss this study, we need some definitions: Unit: units (or individuals) are the objects on which a measurement is taken. Population: the population is the collection of all individuals of interest. Parameter: a parameter is a numerical characteristic of a population. Sample: a sample is a subset of individuals selected from the population. Statistic: a statistic is a numerical characteristic of a sample. Results from this study were reported as follows:
