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