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Box plots (box-and-whisker diagrams) display the five-number summary of a dataset and are ideal for comparing distributions. Students draw, interpret and compare box plots, calculating the interquartile range and identifying skewness.
Our tutors see these errors again and again. Knowing them in advance gives you a head start.
Confusing the interquartile range with the full range
Not using a ruler or drawing to scale on the number line
Making comparisons without referring to specific values (median, IQR)
This topic is tested by the following exam boards. Our tutors are specialists in each one.
Cumulative frequency diagrams show running totals and are used to estimate the median, quartiles and interquartile range. Students draw the characteristic S-shaped curve and read off values at key percentile positions.
StatisticsAverages are fundamental to data analysis. Students must calculate mean, median, mode and range from raw data, frequency tables and grouped data, and understand which average is most appropriate in different contexts.
StatisticsScatter graphs show the relationship between two variables and are used to identify correlation. Students plot data, draw lines of best fit, and use them to make predictions, while understanding the limitations of extrapolation.
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