The null and alternative hypotheses

For each pair of hypotheses that follows, decide whether H₀ and H₁ are set up correctly as the null and alternative hypotheses for a hypothesis test. If so, select "Valid" from the drop down menu. If not, select "Invalid". (4 pairs total)

1 H₀: μ ≠ 81 2 H₀: M = 21
H₁: μ = 81 H₁: M ≠ 21
3 H₀: μ = 117 4 H₀: µ = 239
H₁: μ ≠ 116 H₁: µ ≠ 239
You evaluate the (alternative hypothesis OR null hypothesis) ??? by assuming that it is true and testing the reasonableness of this assumption by calculating the probability of getting the results if chance alone is operating.