In the regression model of Exercise 11.90, is the slope coefficient significantly different from 0 at a = .01?
In exercise

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Conc. 20 20 20 20 20 20 20 20 20 2020 20 Durab. 533 252 49 20.3 55.5 50.7 57.1 34 52.7 42.5 51.7 47.0 Conc. 30 30 30 30 30 30 30 330 30 30 30 Durab. 67.2 66.7 56.7 60.3 68.0 56. 59.9 63.3 64.4 49.3 61.7 62.3 Conc. 40 40 40 40 40 40 40 40 40 40 4040 Durab 64.7 68,0 76.5 69.9 691 50.7 571 65.7 67. 744 73.5 69.9 Conc. 50 50 50 5050 50 50 50 50 5050 Durab. 516 75.7 55.9 76 55.3 73.3 615 53.3 74473.6 76.5 73.3 Conc 60 60 06060 60 60 6060 60 60 60 Durab. 58.7 705 52.5 59.9 65.9 63.3 64.9 53.6 52.5 63.8 59.7 58.9