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What type of study (Observational vs. experimental) is it?

a) You decide to conduct a study to investigate the relationship between consumption of broccoli and weight among kids. You visited 50 schools in Chicago School District and asked children about their usual consumption of broccoli and their weight. What type of data is it (observational vs. experimental; cross-sectional vs. time series vs. panel)?

b) You decide to conduct a study to investigate the relationship between consumption of broccoli and weight among kids. You randomly selected 25 schools and provided broccoli for free for entire year to all kids in those schools while kids from the other schools did not receive any broccoli. You collected information about their weight before and after this intervention. What type of data is it (observational vs. experimental; cross-sectional vs. time series vs. panel)?

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