Most engaged couples expect or at least hope they will have high levels of marital longevity. However, because 54% of first marriages end in divorce, social scientists have begun investigating influences on marital longevity. (Data source: These data were obtained from the National Center for Health Statistics.) Suppose a sociologist sets out to study the role of age of marriage in marital longevity. She measures marital longevity in a random sample of couples married after age 30 and in a random sample of couples married before age 30 and compares the data. Assume that marital longevity is normally distributed and that the variance in longevity is approximately the same among couples married after age 30 as among couples married before age 30. Step 1: Do the data meet the test requirements? A. Is there independent random sampling? No Yes B. What is the level of measurement of the variables? Interval-ratio Nominal Ordinal C. Is the sampling distribution normally distributed? Yes No