6.58 Computing the P-value. A test of the null hypothesis H₀: μ = μ₀ gives test statistic z = 1.89.

1. (a) What is the P-value if the alternative is H_a: μ > μ₀?

2. (b) What is the P-value if the alternative is H_a: μ < μ₀?

3. (c) What is the P-value if the alternative is H_a: μ ≠ μ₀?