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Công nhân của doanh nghiệp A được chia thành 5 nhóm tương ứng với 5 mức năng suất lao động: rất thấp, tương đối thấp, trung bình, tương đối cao và rất cao. Người ta chọn ngẫu nhiên từ mỗi nhóm này ra một số lượng công nhân bằng nhau để tiến hành điều tra về thu nhập. Phương pháp tổ chức chọn mẫu được sử dụng ở đây là:

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