Using the techniques of Section 5.3, test the following two-sided hypotheses:

a. For Equation 5.8, test the hypothesis that:

H₀: ­2 = 160.0

H_A: ­2 ≠ 160.0

at the 5-percent level of significance.

b. For Equation 5.4, test the hypothesis that:

H₀: ­3 = 0

H_A: ­3 ≠ 0

at the 1-percent level of significance.

c. For Equation 5.6, test the hypothesis that:

H₀: ­2 = 0

H_A: ­2 ≠ 0

at the 5-percent level of significance.