spcm 1500 Chapter 12 notes

spcm 1500 Chapter 12 notes - Parameter: Numerical summary...

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Data: The information we gather with experiments and with surveys. Statistics: The art and science of designing studies and analyzing the data that those studies produce. Its ultimate goal is translating data into knowledge and understanding of the world around us. Statistics (short): The art and science of learning from data. Aspects of Statistics Design: Planning how to obtain data to answer the questions of interest. Description: Summarizing the data that are obtained. Inference: Making decisions and predictions based on the data. Subjects: The entities that we measure in a study. Population: The set of all the subjects of interest. Sample: Subjects for whom we have data. Descriptive Statistics: Methods for summarizing data. The summaries usually consist of graphs and numbers such as averages and percentages. Inferential Statistics: Methods of making decisions or predictions about a population, based on data obtained from a sample of that population.
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Unformatted text preview: Parameter: Numerical summary of the population. Statistic: Numerical summary of a sample taken from the population. Variable: Any characteristic that is recorded for subjects in a study. Observations: The data values that we observe for a variable. Categorical: A variable is called categorical if each observation belongs to one of a set of categories. Quantitative: A variable is called quantitative if observations on it take numerical values that represent different magnitudes of the variable. Quantitative Variables A quantitative variable is discrete if its possible values form a set of separate numbers, such as 0, 1, 2, 3 A quantitative variable is continuous if its possible values form an interval. Proportion: The frequency of observations in a category divided by the total number of observations. Percentage: The proportion multiplied by 100. Proportions and percentages are also called Relative Frequencies....
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This document was uploaded on 10/10/2008.

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