2) -Should an observational study or an experiment be performed to answer theresearch question below? Explain your choic

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2) -Should an observational study or an experiment be performedto answer theresearch question below? Explain your choice.-Do people who drink alcohol excessively tend to develop dementiamore frequentiythan those who don't drink excessively?
3 )A professor would like to know what percentage of studentsthat take Biology 110are actually buying the textbook. To ensure arepresentative sample she divided thestudents according to where they primarily took classes (Cal ,tempa And Florida)The college randomly choose 100 students fromeach group.Identify what type of sampling is described above.A)Cluster samplingB)Stratified SamplingC)Voluntary Response sampling D)Systematic Sampling
pls answer the two