GCSE Edexcel Statistics 9-1 - Unit 3
Summarising data 2024
average - a single value used to describe a set of a data as a measure of central
tendency
mode - the value appearing most often
median - the middle value when all the values are in order
mean; arithmetic mean - the sum of all values divded by the number of values
mode in frequency tables - the data value with the highest frequency; not the
frequency
median in frequency tables - the data value at the middle position when ordered
mean in frequency tables - the mean value using fx
modal class - the class with the highest frequency
median class - the class containing the median
, GCSE Edexcel Statistics 9-1 - Unit 3
Summarising data 2024
transforming data - if all values are increased or decreased by the same amount or
percentage, the averages are transformed by the same amount
geometric mean - the nth root of the product of n values; used for percentages
often
weighted mean - the mean when each data value is multiplied by a weight based
on importance
dispersion - how spread out the data is
range - the difference between highest and lowest scores
quartiles - dividing data into four equal parts
interquartile range - the difference between the upper and lower quartiles
decile - dividing data into ten equal parts
Summarising data 2024
average - a single value used to describe a set of a data as a measure of central
tendency
mode - the value appearing most often
median - the middle value when all the values are in order
mean; arithmetic mean - the sum of all values divded by the number of values
mode in frequency tables - the data value with the highest frequency; not the
frequency
median in frequency tables - the data value at the middle position when ordered
mean in frequency tables - the mean value using fx
modal class - the class with the highest frequency
median class - the class containing the median
, GCSE Edexcel Statistics 9-1 - Unit 3
Summarising data 2024
transforming data - if all values are increased or decreased by the same amount or
percentage, the averages are transformed by the same amount
geometric mean - the nth root of the product of n values; used for percentages
often
weighted mean - the mean when each data value is multiplied by a weight based
on importance
dispersion - how spread out the data is
range - the difference between highest and lowest scores
quartiles - dividing data into four equal parts
interquartile range - the difference between the upper and lower quartiles
decile - dividing data into ten equal parts
