A sample of 44 observations is selected from one population with a population standard deviation of 3.8. The sample mean is 101.0. A sample of 56 observations is selected from a second population with a population standard deviation of 4.0. The sample mean is 99.4. Conduct the following test of hypothesis using the 0.10 significance level. H₀ : ₁ = ₂ H₁ : _{1 2}

• Two-tailed test

State the decision rule. (Negative values should be indicated by a minus sign. Round your answers to 2 decimal places.) the decision rule is to reject H₀ if z is outside ()

How do I find the ₁ = ₂ values? I thought it was -1.66