H_{0}: μ_{1} – μ_{2} = δ_{0} | The difference between the population means (μ_{1} – μ_{2}) equals the hypothesized difference (δ_{0}). |
H_{1}: μ_{1}– μ_{2}≠ δ_{0} | The difference between the population means (μ_{1} – μ_{2}) does not equal the hypothesized difference (δ_{0}). |
H_{1}: μ_{1}– μ_{2}> δ_{0} | The difference between the population means (μ_{1} – μ_{2}) is greater than the hypothesized difference (δ_{0}). |
H_{1}: μ_{1}– μ_{2}< δ_{0} | The difference between the population means (μ_{1} – μ_{2}) is less than the hypothesized difference (δ_{0}). |