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26 Cards in this Set
- Front
- Back
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Descriptive Statistics |
Involves arranging, summarizing and presenting a set of data in such a way that useful information is produced. |
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Variable |
Some characteristics of a population or sample. |
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Values |
Possible observations of the variable. |
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Data |
Observations of the variables (datum is singular). |
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Interval |
Real numbers (ex: Distance between 30-40 is the same as 70-80) |
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Quantitative |
Interval data, meaurments of data (ex: how many, how much) |
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Qualitative |
Non-numerical data (such as rating a movie fair or good) |
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Nominal |
Catatagories |
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Ordinal |
Ordered nominal number |
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Frequency Distribution |
Method of presenting data in groups |
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Relative Frequency Distributions |
Frequency distribution giving the percentage each class represents of the total. |
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Bar Chart |
Chart in which vertical bars represent data in different categories |
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Pie Chart |
Circle subdivided into sectors representing the proportion in each catagories. |
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Histogram |
Graphical presentation of a frequency distribution |
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Symettric |
When both sides match |
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Positively Skewed |
Histogram with a long tail to the right. |
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Negatively Skewed |
Histogram with a long tail to the left. |
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Modal Class |
Class with the largest number of observations |
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Binmodal Histogram |
Histogram with two modes. Has two peaks, not nessasarily the same height. |
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Stem and Leaf Display |
Display of data in which the stem consists of the digits to the left of a given point and the leaf the digits to the right. |
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Cross-Sectional Data |
Data measured across a population at the same time. |
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Time-Series Data |
Data measured on the same variable at different points of time |
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Line chart |
Obtained by plotting the points representing the frequency of a category, above the point on the horizontal axis representing that category then joining the points. |
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Scatter Diagram |
the plot of points of one variable against another which illustrates the relationships between them. |
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Linear Relationship |
One in which two variables tend to increase to decrease in the same proportion. |
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Unimodal Histogram |
Histogram with a single peak. |
