9. Incorrect. The answer is true, not false

The test can be formulated has follow:

H₀: μ = 0.25

H_1: μ ≠ 0.25

T = ((`x - μ )*(n-1)^0.5 )/s

T = (0.28-0.25)*9^0.5/0.003

T= 3

a) At 5%

Tcalulated > T table => We reject the null hypothesis at 5% level of significance.

b) At 1%

Tcalculated < T table => We fail to reject the null hypothesis at 1% level of significance.