STA302H1 Midterm: UTSG STA 302 examf10
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Student number: there are 19 pages including this page, the last page is a table of formulae that may be useful. 1: (10 marks) beside each description, write the letter of the term from the list below that provides the best match. (i) What to include when the e ect of x1 on y is di erent for di erent values of x2. (ii) (iii) (iv) (v) (vi) The proportion of variation explained by the regression line. An observed response minus its estimated mean according to some model. A measure of how in uential a particular observation is. A test comparing a model of interest to the model with only an intercept. (vii) A statistic used to identify problems of multicollinearity. (viii) A statistic for comparing models with di erent sets of explanatory vari- ables. (ix) (x) Another name for the estimate of 2 in regression analysis.