STATS 10 Lecture Notes - Lecture 1: Google Analytics, Smartphone
Document Summary
The methodology of collecting, analyzing and drawing conclusions from data. Making effective use of the data around us to make decisions about ourselves and our surroundings. Data collection is used for: election polls, surveys, google analytics (browser history, smartphone apps, sales transactions, hospital and school records, sports, twitter/facebook posts, satellites. Population = collection of observations of interest (united states) This number is very large and nearly impossible to obtain measurements. Sample = a portion of a population of interest (ucla) A sample is usually taken to measure a characteristic about a population. The size of a sample is usually denoted by n. For a single observation, we might note several. Numerical: the values of the bariable are numbers. Categorical: the values of the variable are categories or classifications. Ex: eye color, year in school, class subject. To understand data we have to ask the following questions: Frequencies (or counts) are one way to report a categorical variable.
