As part of a class project, a statistics student conjectures that the internet has caused companies to be more profitable. To evaluate this idea, the student compared the inflation-adjusted average quarterly earnings from a random sample of companies from the 1980s (pre-internet) with a random sample of companies from the 2000s (post-internet). The student found the post-internet group had vastly higher profitability. For this question, select all explanations that can be ruled out when considering why the post-internet group has higher profitability. confounding variables sampling bias O random chance/variability the internet caused the increase

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