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Comparing groups in SPSS depends on your data type and number of groups - you'll typically use Independent Samples T-Test for two groups or One-Way ANOVA for multiple groups. The key is first checking your assumptions about normality and equal variances, but there's much more to consider for proper analysis...
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How to approach this question
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Step 1: Determine the appropriate statistical test based on number of groups and data characteristics
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Step 2: Check assumptions (normality, homogeneity of variance) using diagnostic tests and plots
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Step 3: Run the analysis through SPSS menus and interpret the output tables and effect sizes