# PSYCH339 Lecture Notes - Lecture 2: Standard Deviation, Job Satisfaction, Job Performance

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10 Aug 2016

School

Department

Course

Professor

Lecture 2:

Variance: not everyone is the same (job performance, job satisfaction)

Talkativeness

Intelligence

Without variance, there is no personnel psychology, or psychology, or science

Standard deviation = variance

The average distance away

Standard deviation^2 = variance

Standard deviation = sqrt variance

Prof will often use these terms interchangeably

Variance/standard deviation how different people are

Example:

We want to compare two students

Student A took the SAT

Max score 800

Student B took the ACT

Max score 36

Student A: 600

Student B: 27

Both earned 75% of the maximum points available

The distance is the same but there is no true zero (jnterval scales)

MEAN SD

SAT 500 100

ACT 18 6

Student A: (600-500)/100 = +1.00

Student B: (27-18)/6= +1.50

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