QMS 102 Lecture Notes - Lecture 1: Statistical Inference, Level Of Measurement, Descriptive Statistics
22 Sep 2016
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Document Summary
Statistics is a way to get information from data . Data: facts, especially numerical facts, collected together for reference or information. Statistics is a tool for creating new understanding from a set of numbers. Population: group of all items of interest to the statistics practitioner: all the members of the ryerson university. Parameter: a descriptive measure of a population: mean number of soft drinks sold at ryerson every week. Sample: a set of items drawn from the population: 500 students surveyed. Statistic: a descriptive measure of a sample: average number of soft drinks these students buy per week. Variable: a characteristic of population or sample that is of interest for us: number of soft drinks a student buys every week. Population a population is the entire set of all items under study. Sample a sample is a set of data drawn from the population. Potentially very large, but less than the population.
