STA302H1 Midterm: UTSG STA 302 t2f03sol
Document Summary
Sta 302 / 1001 h - fall 2003. Instructions: time: 50 minutes, aids allowed: calculator, a table of values from the t distribution is on the last page, a table of formulae is on the second to last page, total points: 30. 1. (a) (4 points) state the simple linear regression model in matrix terms, de ning all matrices and vectors. 2: the times to failure (y ) for 20 light bulbs were measured at 20 temperatures (x). A simple linear regression was carried out to explore how the failure time is related to the temperature. (a) (5 points) here are some calculated values from the 20 data points. So estimated intercept is 25. 5 and estimated slope is -1. 77. (2 marks) Estimate of 2: s2 = e n 2 = 789. 7. 18 = 43. 9 (1 mark) e s. e. of b0 =p43. 9(. 105) = 2. 15 (1 mark) s. e. of b1 =p43. 9(. 00335) = . 38 (1 mark)
