STAT 210: Ch. 1 Basic Terms and Concepts
22 Cards in this Set
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Statistics
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The science of data
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Population
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The entire group of subjects about which the researcher wants information
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Parameter
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Some characteristic of the population that the researcher wants to measure
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Mu
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The mean average of a population
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Pi
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The proportion of a population that are successes
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unknown
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The true value of the parameter
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Sample
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A subset of the population
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Statistic
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A descriptive measure that can be expressed or evaluated numerically
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X-bar
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The mean of a sample
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Proportion of a sample that are successes
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Proportion of a sample that are successes
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Inference
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A statement about a population based on the data collected in a sample
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Distribution
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A listing of all the possible values that a characteristic can take and the number or percentage of times that each value occurs
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Descriptive and Inferential
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The two branches of statistics
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Descriptive statistics
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The branch of statistics concerned with numerical and graphical techniques
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Inferential statistics
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The branch of statistics in which we use data and statistics computed from a sample to make statements
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The goal of statistics
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To measure some characteristics about a subject or set of subjects
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Constant
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When the measurement of characteristics do not change i repeated trials
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variable
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When the measurements of some characteristics vary or change from trial to trial
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variables
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The primary observation in statistics
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qualitative and quantitative
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The two categories of variables
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Qualitative variable
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A variable whose measurements vary in kind or name but not in degree
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Quantitative variable
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A variable whose measurements vary in magnitude from trial to trial
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