Log-in | Contact Jeff | Email Updates

Question 399:

When you calculate CIs for time on task, I notice that you use the critical value from the t-distribution (TINV(0.05, degrees_of_freedom)). But when you calculate CIs for task completion rate (using the Adjusted Wald Method), you use the critical value from the z-distribution (1.96). Why don't you use the same value in both?

Need more than just an answer? Download the Easy t Excel T-test Calculator Package which gets you the answer with the detailed calculations.

Not what you were looking for or need help?

Ask a new Question

Browse All 872 Questions

Search All Questions: