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HW Ch 19-20 - Chapter 19 SDM Confidence Intervals for...

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Chapter 19 SDM Confidence Intervals for Proportions 2. Margin of Error The margin of error means that the medical researcher believes the proportion is within 3% of his estimate, with some 95% (probably) degree of confidence. 4. More Conditions a) Population – The Auto Dealer’s customers; sample - The people that recently bought new cars; p- proportion of the customers satisfaction with the Auto Dealers, p (hat) – proportion of those actually dissatisfied with the salesperson (3%); cant use methods of this chapter because it is biased. b) Population – College Students; sample – Those students entering the football stadium, p – proportion of students with cell phones; p (hat) – proportion of those indicating that they actually had a cell phone (8%); if sample (a cluster sample) is representative, then the methods in this chapter will apply c) Population – Potato plants; sample – the potato plants in the field in Maine that are randomly checked, p – proportion of the potato plants that show signs of being
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