Question: A study revealed a strong, linear, positive association between the amount of shampoo used and the length of hair. Another study revealed a strong, linear,

A study revealed a strong, linear, positive association between the amount of shampoo used and the length of hair. Another study revealed a strong, linear, positive association between amount of conditioner used and the length of hair. When the data were combined, the association became negative. What is this an example of? O Observational study 0 Experimental study 0 Cause-and-ef'fect relationship 0 Error by the statistician

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