7 Illustration 15.12. Find the correlation between the ages of husbands and wives from the following data. Age of wives Total Age of husband 15-25 25-35 35-45 45–55 55-65 65-75 15-25 1 1 2 ... 25-35 2 12 1 15 ... 35-45 4 10 1 15 ... ... 45-55 3 6 1 10 ...

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