Analysing DataAQA GCSE Maths: Flashcards

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What is the interquartile range?

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What is the interquartile range?: The difference between the upper quartile and the lower quartile, $Q_3 - Q_1$ .
Why might the median be preferred over the mean?: The median is less affected by outliers than the mean.
What does the height of a histogram bar represent?: Frequency density, not frequency directly.
How do you calculate frequency density?: Frequency ÷ class width.
In a histogram, what does the area of a bar represent?: The frequency for that class interval.
What does a cumulative frequency graph show?: The running total of frequencies, used to estimate the median and quartiles.
What five values does a box plot display?: Minimum, lower quartile, median, upper quartile and maximum.
What is positive correlation?: A relationship where as one variable increases, the other also increases.
What is the difference between interpolation and extrapolation?: Interpolation predicts within the range of given data; extrapolation predicts beyond it and is less reliable.
Does correlation imply causation?: No — correlation shows a relationship exists, but does not prove one variable causes the other.
What is a line of best fit used for?: To represent the trend in a scatter graph and make predictions.
What does an outlier mean for choice of average?: It makes the mean and range less reliable, so the median and interquartile range are often better measures.