11. A company manufactures an electronic device to be used in a very wide temperature range. The company knows that increased temperature shortens the lifetime of the device, and a study is therefore performed in which the lifetime is determined as a function of temperature. The data are listed below - (Check your answer by Excel) Fit a simple linear model relating life-time y to the applied temperature t and find: a) Error variance. b) The coefficient of correlation ( r ). c) Strength of relationship between t and y