PSYCH 100B Lecture Notes - Lecture 8: Statistical Hypothesis Testing, Mg 6
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Between subjects is easier to do and prevents carryover effect. 25 plants in each condition 100 plants total. Plant grows 2 inches without anything + 8 inches from fertilizer + 8 inches from miracle grow. Additive relationship: (b+c) - a = d. If we say for this first example, a difference of 5 is significant. There is a significant main effect of miracle grow such that plants that receive miracle grow grow significantly taller than plants that do not receive miracle grow. There is a significant main effect of fertilizer such that plants grow taller when given fertilizer than when not given fertilizer. We could have 6 plants that all grew 6 inches and have an average of 6 inches. We could also have 6 plants that had a large range of growth but still have an average of 6. No significant effect of fertilizer when no mg is used (difference of 8)
