[ ∑ᵢ=1²⁶ xᵢ=360 ∑ᵢ=1²⁶ yᵢ=2,256.6; ∑ᵢ=1²⁶ xᵢ²=5,365.08 ∑ᵢ=1²⁶ xᵢ yᵢ=31,402 ]. The best straight line through the Massachusetts funding/graduation rate data described has the equation y
= 81.088+0.412x, where s=11.78848. Construct a 95% confidence interval for β₁



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