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25 Cards in this Set
- Front
- Back
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descriptive statistics
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there are two types of descriptive statistics graphical and numerical
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inferential statistics
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a body of methods used to draw conclusions about a population based on a sample
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population
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set of all individuals or units of interest in a statistical problem
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sample
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set of data drawn from a population
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parameter
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numerical fact about a population or discriptive measure about the population
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statistic
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a numerical fact about a sample
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statistical Inference
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this is the process of making an estimate, prediction, or decision about a population
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confidence level
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the proportion or percentage we expect an estimating procedure to be correct
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significance level
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the proportion of times we expect an estimating procedure to be wrong
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variable
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any characteristic of a population or sample that is of interest or being studied
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Data
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actual values (measurement or observations) of variables can be qualitative or quantitative
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Quantitative data
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numerical observations (two types) Discrete where two consecutive values cant have another place in between and continuous for any two values thate ar many places between
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Quantitative continuous
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for any two values thate are many places between between 5-6 ther is 5.1 5.5
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Quantitative Discrete
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where two consecutive values cant have another place in between
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Qualitative data
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categorical observations eye color hair color race
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cross sectional data
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one time not ongoing collection of data market survey opinion polls
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time-series data
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collected over time sometimes long periods of time
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pie chart
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most popular for viewing nominal information
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bar charts
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graphical representation of the frequency(how often a result occurred) on a vertical or horizontal scale
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line charts
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used to show trends
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FREQUENCY DISTRIBUTION
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a table that groups data into non-overlapping intervals and classes
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Histogram
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graphical summary of data
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symmetry
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histogram is identical along a vet axis
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positively skewed
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histogram tail facing right
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negatively skewed
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histogram tail facing left
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