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Statistics
Quick questions on Data presentation and interpretation: averages, spread, outliers and correlation - OCR A-Level Maths A
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are outliers?Show answer
An outlier is a value far from the rest. Two common rules are: more than beyond a quartile, or more than two standard deviations from the mean. The question states which rule to use.
What are comparing two distributions?Show answer
To compare data sets, always compare a measure of location and a measure of spread, in context. For example "the median mark of class A (62) is higher than class B (55), and class A's smaller interquartile range (10 versus 18) shows its marks were more consistent."
What is q1?Show answer
A class width is and the frequency is . Find the frequency density. [1 mark]
What is q2?Show answer
Data has mean and standard deviation . Using the two-standard-deviation rule, find the upper outlier boundary. [2 marks]
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