Term
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Definition
| Data that is not organized in a meaningful way |
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Term
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Definition
| Observations that have similar values |
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Term
| What is frequency distribution? |
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Definition
| Tells us how common certain ranges of data values are. Both in a relative sense and in a absolute sense |
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Term
| What are class intervals or bins? |
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Definition
| All the observations that have values within a certain range belong to a class interval |
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Term
| What do you need to know to calculate the width (range) of the class interval? |
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Definition
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Term
| Equation to calculate the width (range) of a class interval? |
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Definition
| Range = largest data value - smallest data value |
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Term
| What do you do if you have non-integer values? |
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Definition
| Round the smallest number down and the largest number up |
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Term
| What is the class midpoint? |
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Definition
| Just a halfway point for each class interval. Alternatively its just the average between the two end points |
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Term
| How to calculate the Class Midpoint? |
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Definition
| CI lower bound +CI upper bound/2 |
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Term
| How to calculate the Width? |
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Definition
range/# of class intervals + 1 if an integer
range/# of class intervals and round up if non-integer |
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Term
| What is a cumulative frequency? |
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Definition
| Just a running total of relative frequencies |
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Term
| What is a relative frequency? |
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Definition
Just the proportion of share of the total frequency distribution accounted for by one particular class interval
Should be 1 or 100% |
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Term
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Definition
| A series of vertical bars whose height tells us how many times data values fell within a certain class interval |
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Term
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Definition
Is essentially the same as a histogram but 2 differences.
We plot the class midpoints as dots for each bin
We connect the dots using line segments |
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Term
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Definition
Its continuous like eh frequency polygon, but the difference is that you graph cumulative class endpoints
Can never go down, its a running frequency |
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Term
| What is stem and leaf plotting? |
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Definition
Has a visual art to it.
Place the stems in numerical order from top to bottom. Then horizontally list each leaf for each stem |
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Term
| When do we use a scatter plot? |
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Definition
| When graphing values of two variables |
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