Some final notes about marks and grades, in response to questions raised in this and other courses.
Continue reading Exam on Tuesday
I’ve uploaded reports on the written assignment and on last year’s Inf1-DA exam. These give detailed notes on solutions and discuss the range of answers given by students. You can also find these on the coursework web page and the ITO past paper pages.
Please 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.
|Feedback for this course:||Informatics 1: Data & Analysis|
|All surveys on MyEd:||Course Enhancement Questionnaires|
|Reports from previous years:||Student Course Feedback|
In this final lecture I reviewed two questions from last year’s exams: one on entity-relationship modelling and database queries; and another on statistics and hypothesis testing. The slides give details of the questions and some possible answers, with notes on which elements are important in preparing a solution.
Today’s lecture introduced a selection of data scales — refinements of the qualitative/quantitative distinction — and discussed in more detail issues of the application and misapplication of statistics.
Continue reading Lecture 19: Data Scales; Correlation and Causation
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.
Continue reading Lecture 18: Hypothesis Testing and chi²
The tutorials web page now has the latest set of exercises. As before, Question 1 is based on content of Tuesday’s lecture, and material for Question 2 appears on Friday.
Continue reading Week 10 Tutorial Exercises: Statistical Analysis