This preview shows page 1. Sign up to view the full content.
Unformatted text preview: culating the variance
Calculating the variance
4: Add the squared deviation scores
for each value of X s 2 ∑(X − M )
=
n −1 2 Calculating the variance
Calculating the variance
5: Divide the sum of the squared deviation scores
by the number of X’s in the sample, minus 1 s 2 ∑(X − M )
=
n −1 2 Measures of dispersion: Measures of dispersion: Standard deviation
• Square root of the variance
Standard deviation = s = Variance
Standard deviation = s = ( X − M )2
∑
n −1 Quantitative Research Strategies
Continued •
•
• Nonexperimental Experimental
Quasiexperimental Quantitative Research Strategies • Nonexperimental research strategies – No manipulations
– No attempts to control other variables
• Typically, while you may be able to identify correlations between variables, you will be unable to positively define causal relationships • Nonexperimental research strategies can be further divided into two main categories
–
–
– Descriptive research Correlational research Nonexperimental group comparison research Descriptive research Descriptive research • Descriptive research does not examine the relationship between variables. Instead, it simply describes the current state of a variable or variables – Unlike all other strategies, you are not trying to make a comparison between different groups
• How many hours do Psyc2001 students spend studying each week?
• What is the average income in Canada? • Data analysis – Typically use desc...
View
Full
Document
This note was uploaded on 03/12/2013 for the course PSYC 2001 taught by Professor Mathewyoung during the Winter '11 term at Carleton CA.
 Winter '11
 Mathewyoung
 Psychology

Click to edit the document details