State

Make sure to state what your parameters (μ₁ and μ₂) means in context!

Plan - Two-sample t-test for μ₁ - μ₂

Random sample: Must be determined by you. Is this a random sample or random assignment in an experiment?

10% rule: Must be determined by you. Are both of your sample size smaller than 10% of the population?

Calculate

To find our critical t* value, you can use the inverse t function on your calculator or use a table with critical t values.

* The df_c value is the conservative degrees of freedom, which is acceptable on an AP exam. However, this calculation for the interval uses the true df value.

Conclude

Please keep in mind that you should always write your conclusion in the context of the problem.