All posts by Ian Stark

Student Course Feedback

Screenshot of survey pagePlease fill out the short online feedback survey for Inf1-DA. This is organised centrally by the University, with all results sent to the individual course organiser and to the Director of Teaching. I read every comment individually, and for Informatics courses we post results online to help other students choosing courses for the future.

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Feedback for this course: Informatics 1: Data & Analysis
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Lecture 18: Hypothesis Testing and chi²

Title slide

Slides : Recording

Today’s lecture revisited the idea of correlation in data sets, and introduced the method of hypothesis testing for identifying whether features observed in samples in fact arise by chance.

For paired series of numerical data we can use the correlation coefficient, and for qualitative data the χ2 statistic. The lecture included examples of this applied to last year’s Inf1-DA exam results, bigram frequency in the British National Corpus, and possible gender bias in student admissions to Berkeley in 1973.
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