Meausres of location and spread
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7 Terms
How to find the Lower Quartile from a list? (Q1)
If n/4 is an integer, add 0.5. If n/4 is not an integer, round up no matter what.
How to find the median from a list? (Q2)
If n/2 is an integer, add 0.5. If n/2 is not an integer, round up no matter what.
How to find the upper quartile from a list (Q3)?
If 3n/4 is an integer add 0.5. If 3n/4 is not an integer, round up no matter what.
When comparing data, what 3 things should be considered?
1) Mean/median/mode 2) Interquartile range/range 3) Variance/standard deviation
What is different about finding quartiles in grouped data?
It will be either n/4, n/2 or 3n/4. No adding 0.5 or rounding.
When using interpolation, what do we assume?
All values data values are uniformly distributed within their class
How will adding a value into a dataset affect the standard deviation?
If the value is significantly above 1 standard deviation away from the mean, it will increase. If the value is within 1 standard deviation of the mean, it will decrease.