UA PSY 230 - Lecture Notes (49 pages)

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Lecture Notes



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Lecture Notes

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Lecture Notes


Pages:
49
School:
University of Arizona
Course:
Psy 230 - Psychological Measurement and Statistics

Unformatted text preview:

Lecture 11 Introduction to ANOVA Experiment First born children tend to develop language skills faster than their younger siblings One possible explanation for this phenomenon is that first born have undivided attention from their parents A researcher wanted to test this theory by comparing the language development of language across only children twins and triplets Davis 1973 predicted that the multiple birth children should have slower language development ANOVA ANOVA or analysis of variance a hypothesis testing procedure that is used to evaluate differences between 2 or more samples It is an omnibus test permits the analysis of several variables at the same time Nice because we have greater flexibility in designing our experiments We can make multiple comparisons with one test single child vs twins single child vs triplets twins vs triplet ANOVA and research design Independent Measures 2 or more different samples Repeated Measures 2 or more measurements from the same sample The same sample is tested across all the different treatment conditions Mixed Design ANOVA and Research Design Independent variable Now we can test more than one independent variable Say we wanted to look at language development across 2 independent variables of births at one time and SES Note SES and births are quasi independent variables we are differentiating our groups by them but can t manipulate them single twins triplets Hi SES sample 1 sample 2 sample 3 Factors The independent factors sample 4 variables sampleare 5 called sample 6 in Lo SES ANOVA A study with only 1 IV is a single factor design A study with more than 1 IV is a factorial design Levels individual groups w in a factor Example Therapy Meditation Talk Hi Support sample 1 sample 2 Lo Support sample 4 sample 5 Drug sample 3 sample 6 How many factors are in this design What are they What are the levels of each factor Drug Dosage 0 mg placebo 25 mg 50 mg sample 1 sample 2 sample 3 How many factors are in this design What What



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