For testing of hypothesis H₀ : M₁ = M₂ and H₁ : M₁ < M₂, the critical value of Z at 5% level of significance when size of sample is more than 30 is

A. The central limit theorem B. The law of statistical regularly C. The law of inertia of large numbers D. None of the above

A. Sampling error B. Measurement error C. Coverage error D. Non-response error

A. Both (A) and (R) are true B. (A) is true, but (R) is false C. (A) is false, but (R) is true D. Both (A) and (R) are false

A. 0 B. 1 C. 0.4 D. 0.8