Question: A medical researcher wants to estimate the difference in the proportions of women with high blood pressure for women who use oral contraceptives versus women who don’t use oral contraceptives. In a observational study involving a sample of 900 women the researcher finds that 15% of the 500 women who used oral contraceptives had high blood pressure, whereas only 10% of the 400 women who didn’t use oral contraceptive had high blood pressure.

1. What is the research question?
2. What is the population parameter in this study?
3. What is the value of the sample estimate in this study?

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