1. PLS 205 Discussion 1 1/6/2015

2. Outline Tips about the course Population statistics vs. samples statistics Z and t distributions Use of normal distribution – One tailed vs. two tailed test – How to use the probability calculator for Z and t Tips on homework question How to test for normal distribution

3. Questions?

4. Tips about the course Logins! – Username: Kerberos ID – Password: Kerberos Password Discussion format: – Time for student questions – Small lecture – Evaluation halfway through quarter

5. Tips for the course Questions to homework problems – During my office hours or by arrangement – Coding questions will not be answered via email Homework: – Start homework early – Work together – Review HW tips on website

6. Tips for the course Quiz: – 5% of your grade – start looking at the questions now – Try to answer the questions as we go through the topics…do not wait until the night before!!

7. Population Statistic vs. Sample Statistic Population Estimates are based on the measurement of all the individuals in a population Greek letters are used to represent the parameters – e.g. µ, σ, and N Sample Estimates are based on the measurement of a sample from a population Greek letters are not used to represent the parameters – e.g. Ῡ, s, and n

8. Z and t Distributions

9. One-tailed vs two-tailed How to use probability calculator for Z and t

10. Tips on homework question 2.1.4 for HW1 NOTE: If you missed the discussion please ask during office hours.

11. How to Test for Normal Distribution