SUNY College at Buffalo Sociology 301 (Social Statistics)
Homework #6: To be due at the beginning of the last class prior to the second exam
Dr. ZHANG Jie

Submit your work on a Word file with the homework #, your name, and the date on top of it. You do not have to copy the questions, but the number of the question has to appear before your answer to each of them. The highest possible score for this homework is 10.

Essay Question 1:

What is the probability of an event based on?  Illustrate it with examples.

Essay Question 2:

What is the difference between a population and a sample?  What are the characteristics of each of them?

Essay Question 3:

What is a confidence level, and its relationship with significance level?

Essay Question 4:

What is a random sample and why is it important?

Computer Assignment:

You do not use computer for this assignment.  Instead you use the Appendix at the end of the textbook.

What is the difference between z distribution and t distribution?  What they are for respectfully?  Why do we have to use df in t distribution?  What does df mean?