In a 2009 study, Tolkamp, Haskell, Langford, Roberts, and Morgan fitted 10 cows with monitors that recorded whether the cow was standing or lying down every minute of the day. They discovered a strong positive correlation between the length of time lying down and the probability they would stand up, but found it more difficult to predict when they would lie back down. What is the population of this study? Cows who are currently standing up The 10 cows in the study All cows Cows who are currently lying down

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