phil001notesWeek11 - Dr Mcs Philosophy 001(1091 Lecture...

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1091001notesWeek11 © 1 Dr Mc’s Philosophy 001 (1091) Lecture Notes, Week 11 © Assignment #6 (the last one!) is available on the Net. It is due in your tutorial next week (week 12, 23-27 March) Second midterms to be returned next week, with a graph of results shown in lecture. Back to correlations Suppose there is a positive correlation between A and B in population p. What follows? Most A are B [in p]? No —All that’s required is that the percentage of A that are B is greater than the percentage of ~A that are B [in p]. Perhaps it’s not the case that most students who attend class regularly get good grades, but there might still be a correlation between attending class regularly and getting good grades. Example: Only 40% of students who attend regularly do well, but only 30% of those who don’t attend regularly do well. More A are B than ~A are B? No the size of the sub-populations could be different. What if only 100 people attend class regularly and the remaining 330 don’t. Of the 100, say 70 do well. Of the 330, say 100 do well. Nonetheless, attending class regularly is positively correlated with doing well.
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