RESEARCH STUDY 9.4: Dr.O'Toole is a counseling psychologist who researches family dynamics.He is curious as to whether there is a causal link between the amount of time families spend together on vacation and children's happiness.More specifically, he thinks that spending more time together as a family on vacation causes children to be happier.He designs a study where he samples 63 single-child families in December 2012 and measures how many days the family spent on vacation in the past year as well as the child's happiness.He then contacts the same families in December 2016 and measures those two variables again.The results of his study are below. Describe what makes Dr.O'Toole's study (1) a longitudinal study and (2) a multivariate correlational study.

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RESEARCH STUDY 9.4: Dr.O'Toole is a counseling psychologist who researches family dynamics.He is curious as to whether there is a causal link between the amount of time families spend together on vacation and children's happiness.More specifically, he thinks that spending more time together as a family on vacation causes children to be happier.He designs a study where he samples 63 single-child families in December 2012 and measures how many days the family spent on vacation in the past year as well as the child's happiness.He then contacts the same families in December 2016 and measures those two variables again.The results of his study are below.  Describe what makes Dr.O'Toole's study (1) a longitudinal study and (2) a multivariate correlational study.

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The Answer of RESEARCH STUDY 9.4: Dr.O'Toole is a counseling psychologist who researches family dynamics.He is curious as to whether there is a causal link between the amount of time families spend together on vacation and children's happiness.More specifically, he thinks that spending more time together as a family on vacation causes children to be happier.He designs a study where he samples 63 single-child families in December 2012 and measures how many days the family spent on vacation in the past year as well as the child's happiness.He then contacts the same families in December 2016 and measures those two variables again.The results of his study are below.  Describe what makes Dr.O'Toole's study (1) a longitudinal study and (2) a multivariate correlational study.