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Statistics Lecture 11 1. d tells you the difference between the means in standard deviation units 2. when d is negative it means the sample mean is less than the population mean.but the negative does not really matter 3. when z is negative, sample me
Statistics Lecture 9 Quiz 2 will cover mostly correlation and regression-only definitional for hypothesis testing.what is null hypothesis. How do you know if you have practical vs. statistical significance. What is type I and type II errors. Look onl
Lecture Outline
Why do we need statistics Basic math concepts Statistical terminology
The Basics
Research
Why do we need statistics?
Lecture Outline
Why do we need statistics Basic math concepts Statistical terminology
Basic math concepts
Formula Sheet #1 Week of 1/21/08
I.
Mean
Central Tendency & Variability
= (Xi ) / N
M = (Xi ) / N
Variance:
2 = ( X - )2 / N
s 2 = ( X - M )2 / N - 1
Variance (computational formula) =
2
X = X
2
- ( X ) 2 / N ) N - ( X ) 2 / N ) N -