The predicted value is Ŷ = −94.88 + 0.2796 × 3,300 = 827.8.
The upper limit for a 95% confidence interval = Ŷ + tcsf = 827.8 + 3.182 × 15.5028 = 827.8 + 49.33 = 877.13.
The critical value of tc at 95% confidence and 3 degrees of freedom is 3.182.
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