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In a study on work efficiency, subjects are classified into four groups by the number of children they have (zero, one, two, three or more).
In a study on work efficiency, subjects are classified into four groups by the number of children they have (zero, one, two, three or more). Samples of 50 men and 50 women are drawn from each group. The number of days each person misses work per month is recorded. How many total observations are there in this study
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