Grouped Frequency Tables Flashcards
When are troubled frequency tables useful
When you have a large range of data because then you don’t need to draw a column/row for each value
What is the data spilt into groups by in group frequency tables
Class intervals
Should class intervals overlap
Should never overlap
Do discrete data class intervals have gaps
Yes
Do continuous data class intervals have gaps
No
When can the first and last classes be left open ended
When there are only a few values at either end of the data
Advantages if grouping the data
Easier to understand and analyss
Disadvantages of grouping data
Less accurate as you dint know the exact values - so calculations are only estimates
when are equalities used in grouping data
If the data is continuous e.g 5 -<h<10
What can distort continuous data
If the data has been rounded
