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.. . QUESTION 4 Based on the case study below, if stratified sampling been employed to select 500 employees. Briefly explain how you conduct it. A group of doctor wanted to investigate the awareness of parents towards on the factors that contribute to severe hand, foot and mouth disease (HFMD). The questionnaires are distributed to 500 randomly selected parents from five districts in the state. Among the variables selected in the survey are age, gender, occupation, position of residence, number of children, and the awareness towards the factors contributed to HFMD problems. The distribution on the number of parents is shown in the following table. District Number of Parents 320 370 280 300 230