Instructors should assign this problem (about how temperature impacts mood) to students as in-class practice or homework after students have learned how to calculate a *t*-test for independent means and test for significance.

The activity leads students through determining the type of statistical analysis to use, the hypotheses, calculating the t-ratio and effect size (if appropriate), making a decision about the null hypothesis and summarizing the results. An answer key is included.

Please click here for the file.