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A Behaviorist Has Performed the Following Experiment

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A behaviorist has performed the following experiment.For each of 10 sets of identical twins who were born 30 years ago,he recorded their annual incomes,according to which twin was born first.The results (in $1,000s)are shown below.Can he infer at 5% significance level that there is a difference in income between the twins?
A behaviorist has performed the following experiment.For each of 10 sets of identical twins who were born 30 years ago,he recorded their annual incomes,according to which twin was born first.The results (in $1,000s)are shown below.Can he infer at 5% significance level that there is a difference in income between the twins?

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blured image vs. blured image (First born - Second born)
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