Goal is discovery and making sense out of numbers.
Minimum= Being able to determine if your guess is correct.
Statistics is divided into
Prediction & Regression
Standardized Regression Coefficient= Beta ()
Formula with Z scores:
Predicts your score in terms of standard deviation (Z Scores)
Predicted Zy = ()(Zx)
Standardized Regression Coefficient:
Inferential Statistics: Draw conclusions from data acquired (descriptive).
Sample vs. Populations
Allows you to generalize to the public
Levels of Measurement & Tables
Levels of Measurement
Can be measured
Equal Interval Variable (Interval)
Equal Amounts of what is being measured
Distance from 2.5-2.8 = Distance from 3.5-3.
Correlation- Statistics for two or more variables
Ex: GRE Scores and College GPA
Pornography and Sexual Assault
Chocolate and High Exam Grades
Activities and Marital
Exam 1 Review Basic Statistics for Psychology
Describe the two branches of statistics.
Know the levels of measurement.
How do you construct a frequency table? Percentages? Cumulative? What are they used
Histograms and Distributions: Know h
Variability, Std Dev, & Z-scores
How scores are spread out in a distribution
Could have same mean, and different variance
Different mean, same variance
Variability can influence other variables
Ex: Stats and
PSYC 2317- 202
Tuesday and Thursday 9:00AM10:15AM, BH 118
Basic Stats for Psychology
Department of Psychology and Communications
Instructor: Mr. Ray Garza
Office: CH 312 F
Tendencies & Representativeness
Central Tendency and Variance
The focus of descriptive statistics is to make scores understandable.
Describe Scores in terms of
Mean, Mode, and Median
The Normal Curve
What is the normal curve?
Scores around the center
Uni-Modal, Roughly symmetrical (Bell shape)
Extremes at each end
Scores on a
Charts and Distributions
Type of Bar Chart
Highest point represents most occurring score
If ascending order connect
If using nominal data, separate or use bar chart
Grouped Frequency data, l