You are a data scientist of an e-commerce platform. You are debating with your colleague whether it is better to use observational data or experimental methods to test the effectiveness of a marketing campaign. Your colleague argues that it is better to use observational data versus you think it is better to use experimental methods. Specifically, your colleague said that observational data can be collected in real-world settings without manipulating any variables, thus fully capture the complexity and nuance of real-world marketing campaigns. Try to provide counterarguments against your colleague’s argument
 In your entire response, the letter h should appear less than 32.
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