STAT 30100 Lecture 1: STAT 301 Chapter 3 Lecture 1
9 Oct 2018
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Sample: population: entire group of entities that we want to study and get information about, sample: part of the population that we actually examine in order to gather information about. Parameter vs. statistic: parameter: it is a fixed number that describes the population but in practice we do not know its value, statistic: it is a number that describes the sample. Its value is known when we choose the sample, and it can vary from sample to sample. We design a study to determine the average lifetime of battery x . Suppose the factory produces 1,000,000 x for a month. We measure the average lifetime of 200 batteries. In conclusion: based on the values of the statistic we will infer the value of the parameter. Types of samples: voluntary response sample: consists of people who choose themselves by responding to a general appeal.
