Problem #1: The relationship between time to fracture of steel and the stress applied to steel was of interest in an experiment Suppose we have data from such an experiment involving steel. i stress time 1 2 3 4 3.4 5 6.9 7.8 45.4 51.1 37.2 42.5 5 10 38.1 (a) Which variable is the explanatory variable? (b) Which variable is the response variable? (c) Determine the least squares regression line. 6 7 8 14.9 16.9 18.3 36 30 26 9 10 18.9 29.9 28.4 20

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