1. 1 PSY 230, Jacobs Welcome to PSY 230 Introduction to Statistics Elizabeth Jacobs, Ph.D.

2. 2 PSY 230, Jacobs Definitions u Statistics u Population u Sample u Parameter u Statistic u Data u Raw score u Variable u Constant

3. 3 PSY 230, Jacobs Two Types of Statistics u Descriptive u Inferential

4. 4 PSY 230, Jacobs Scales of Measurement: u Nominal u Ordinal u Interval u Ratio

5. 5 PSY 230, Jacobs Scientific Method u Hypothesis u Variables u Subjects u Groups u Treatment, no treatment u Observation u Data Reduction u Inferential statistics

6. 6 PSY 230, Jacobs Statistical Notation: Solve: X 2,  X,  XY,  X 2, (  X) 2,  XY,  X+4  X,  XY,  X 2, (  X) 2,  (X+Y),  (X+4),  X  Y Y45523Y45523 X32273X32273 X 2 XY X+4