What is the typical age difference between husband and wife? The following data represent the ages of husbands and wives, based on results from the Current Population Survey.

(a) What is the response variable in this study?
(b) Is the sampling method dependent or independent? Explain.
(c) Use the data to estimate the mean difference in age of husband and wives with 95% confidence. Explain the technique that you used.

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Couple Couple Couple Couple Husband 47 53 45 50 Wife 43 43 45 48 Couple Couple Couple Couple 6. Husband 28 65 25 56 Wife 29 61 27 51