Mathematics, 14.05.2021 16:20 tblynch21

In which of the following scenarios would an observational study be used instead of a survey or experiment ? a) a study to quantify the effect of humidity levels on plant growth b) a study to determine how age effects political preference ) to measure the level of support for a referendum d) a study to observe the effects of a medicine designed to lower cholesterol

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In which of the following scenarios would an observational study be used instead of a survey or expe...