Stat 1102 lecture notes 1

Fundamental elements experimental unit object upon

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Fundamental elements Experimental unit Object upon collecting data Ex: person, thing, transaction, or event Population Set of units that we are interested in studying Ex: usually people, objects, transactions or events Variable Characteristics or properties of an individual experiment unit Derived from the fact that any particular characteristic may vary among the experimental units in a population
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Measurement is the process we use to assign numbers to variables of individual population units Sample Subset of population o P population & parameter (Greek) o S sample & statistics (English) o Statistics inference – estimate or prediction or generalization about a population based on information contained in a sample Use the information contained in the sample to learn about the larger population o Measure of reliability – statement (usually quantified) about the degree of uncertainty associated with a statistical inference Reliability: how good the inference is o Four elements of descriptive statistical problems The population or sample of interest One or more variables (characteristics of the population or sample units) that are to be investigated Tables, graphs, or numerical summary tools Identification of patterns in the data o Five elements of inferential statistical problems The population of interest
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