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| A collection of procedures and principles for gathering and analyzing data to help make decisions when faced with uncertainty |
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| All the objects on an individual about which information is desired. |
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| A subset of the Population |
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| One for which every member of te population has the same chance to e selected for the sample. |
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| A characteristic of an object or individual that can differ from one entity to another. |
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| The number of observations in a sample. |
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| A "Summary Measure" calculated from a sample. |
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| A "Summary Measure" for the entire population. |
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| A quality of an object Ex: Hair color |
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| A numerical value or measurement taken on an object. Ex: Weight, Height |
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| One whose possible values are real numbers in an interval of real numbers |
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| Wat we measure on the object |
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| May explain what we see in the response. |
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| The average of a Data set |
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| A number such that half the values are less than the number and half the values are greater than the number. (Simply the middle number in the data set) |
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| The median of the lower half of the data set. (at the 1/4th mark) |
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| The median of the upper half of the data (3/4 mark) |
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| Fundamental rule for using data for Inferences |
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| The data is representative of the population. |
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| Simple Random Sample (SRS) |
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| Every possible group of size "n" has the same chance to be the selected sample. |
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| Leaving out part of the population in the sample. |
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| People do not respond, leaving part of the sample empty. Ex: Someone does not mail back a Census form. |
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| When a response is given to a question. |
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| Range, InterQuartile Range (IQR), Stand. Deviation |
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Use the Mean when the graph is:
Use the Median when the graph is: |
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Mean= Symetrical
Median= Skewed |
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Range= Min-Max
IQR= Q1-Q3 |
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Only Bell Curves.
Z=Value-mean/Stand. Deviation
Z=X- |
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