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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...
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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.

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