For x: 1, 2, 3, 4, 5 and y: 2, 4, 5, 4, 5, what is the least-squares regression line of y on x?
Correct answer A. y = 2.2 + 0.6x
Explanation
b = Σ(x − x̄)(y − ȳ) / Σ(x − x̄)² = 6/10 = 0.6, and a = ȳ − b x̄ = 4 − 0.6 × 3 = 2.2.
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