The scatterplot below shows the relationship between happiness and number of pets owned for 57 people, based on a survey.     Can we conclude that having pets causes an increase in happiness? __Yes, this is an experimental study __Yes, this is an observational study __No, this is an observational study __No, this is an experimental study   Can we conclude that having pets is correlated to happiness? __Yes, this is an experimental study __Yes, this is an observational study __No, this is an observational study __No, this is an experimental study

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