The results from a regression model analysis are shown as follows:

The numbers below the coefficient estimates are the sample standard errors of the coefficient estimates.
a. Compute two-sided 95% confidence intervals for the three regression slope coefficients.
b. For each of the slope coefficients, at the 5% level of significance, test the hypothesis H₀ : β_j = 0

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ŷ = -61.50 +21.8x₁ + 23.7x2 - 15.4x3 (2.1) (22.4) (32.4) R² = 0.74 n = 25