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In a regression model involving 30 observations, the following estimated regression equation was obtained:

= 17 + 4X₁ - 3X₂ + 8X₃ + 8X₄

For this model SSR = 700 and SSE = 100. The conclusion is that the

a. model is not significant

b. model is significant

c. slope of X₁ is significant

d. slope of X₂ is significant

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