Analysing data
Analysing data. Year 10 Intermediate maths NSW curriculum
Terms
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- class centre
- the middle number of a class interval
- quantitative
- data that is measurable; obervations based on numbers
- Score
- A value in a set of data
- Frequency polygon
- another name for an ogive
- cumulative frequency
- a progressive or running total of the frequency
- data
- information; facts, figures
- mean
- the sum of all scores divided by the number of scores
- grouped data
- data that has been put together in class intervals
- Cluster
- Bunched up data
- column graph
- type of graph most often used for categorical data
- Range
- Maximum minus the minimum
- standard deviation
- a measure of spread of the scores about the mean
- Positive skew
- the data is skewed to the left
- ogive
- Another name for the cumulative frequency polygon
- box-and-whisker plot
- A diagram that shows the minimum, Q1, median, Q3 and maximum for a set of data
- Q1
- The first quartile
- frequency
- how often a score is represented in the data
- interquartile range
- the difference between the upper quartile (Q3) and the lower quartile (Q1)
- Median
- The middle score ion a set of data
- measures of location
- Mean, median and mode. Also called 'measures of centre'
- symmetrical
- data that is evenly distributed about the mean
- measures of spread
- a collective term for range, standard deviation and interquartile range
- Outlier
- a value that is clearly separated from the main body of data
- modal class
- the middle class in grouped data
- Skewed
- The data is clustered at one end
- Quartiles
- The values that divide the data into four equal parts
- categorical
- data that is not numerical but based on categories like colour, sex or type
- average
- another word for mean
- Mode
- the most common score in a set of data
- Q2
- The third quartile
- Negative skew
- the data is skewed to the right