![]() At the end of the growing season, the mean yields from the plots will be compared. Fifteen similar plots of land are planted with the same type of seed but are fertilized differently. ![]() Study: Medicine Mix-ups hurt about 1 in 15 hospitalized kids Study: Painkillers don’t help older brains Healthy eating adds up on grocery bills Ginger helps relieve nausea in chemo patientsĬh 13 Elements of an Experiment Experimental units: Subjects or participants: Factors: Levels: Treatments:Ħ Example A farm products manufacturer wants to determine if the yield of crop is different when the soil is treated with three different types of fertilizer. Only an experiment can prove causal relationships Explanatory variable Response variable Observational study – Experiment - A study in which the researcher merely observes what is happening or what has happened in the past A study in which the researcher imposes a treatment in order to measure a response Presentation on theme: "Stats: Modeling the World"- Presentation transcript:
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