QMS 102 Lecture Notes - Lecture 1: Statistical Inference, Ryerson University, Statistical Hypothesis Testing
1 Nov 2017
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Document Summary
What is statistic: statistics is a way to get information from data. Data: facts, especially numerical facts, collected together for references or info. A student is somewhat apprehensive about the statistics course because the student believes the myth that the course is difficult. The professor provides last term"s marks to the student. Median of all marks, (cid:498)typical(cid:499) mark, i. e. average: population: group of all items of interest to the statistics practitioner. All the members of 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, frequently very large.
