Title: “Practice Problems in Fundamental Statistics for the Social and Behavioral Sciences”

I have included questions as attachments: It should be three questions
Complete exercises numbered 12, 18, and 20 in your textbook. They are at the end of chapter 2, listed under 2.12 Exercises, on page 45 in the textbook. 
Textbook: Tokunaga, H. (2019). Fundamental Statistics for the Social and Behavioral Sciences (2nd ed.). Thousand Oaks, CA: Sage Publications, Inc