Formulae: Unit 14 5.0 / 5 based on 1 rating ? MathematicsFurther statisticsGCSEEdexcel Created by: annanolanCreated on: 21-11-16 18:03 What is population? The set of terms that you are interested in 1 of 17 What is a census? A survey of the whole population 2 of 17 What is a sample? A smaller number of items from the population 3 of 17 How do you reduce bias? The sample must represent the whole population 4 of 17 What are strata? When the population is divided into groups such as age range or gender 5 of 17 What is a stratified sample? When the number of people taken from each group is proportional to the group size 6 of 17 What is a cumulative frequency diagram? A graph with data values on the x axis and cumulative frequency on the y axis 7 of 17 How do you estimate the lower quartile on a cumulative frequency diagram? The n/4th value 8 of 17 How do you estimate the upper quartile on a cumulative frequency diagram? The 3n/4th value 9 of 17 Where do you plot the point in grouped data? On the upper bound of the group 10 of 17 How do you work out the upper quartile for a set of n data values? The UQ is the 3(n+1)/4th value 11 of 17 How do you work out the lower quartile for a set of n data values? The LQ is the n+1/4th value 12 of 17 What is a comparative box plot? Box plots for two different sets of data in the same diagram 13 of 17 What is a histogram? A frequency diagram used for grouped continuous data where the class intervals are unequal 14 of 17 How do you calculate frequency density? frequency / class width 15 of 17 How do you describe a date set? Give a measure of average and a measure of spread 16 of 17 How do you compare data sets? Compare a measure of average and a measure of spread 17 of 17

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