sol_hw_02 - Solutions Gathering Data 4.5 School testing for...

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Solutions – Gathering Data 4.5 School testing for drugs : Although this study found similar levels of drug use in schools that used drug testing and schools that did not, lurking variables might have affected the results. For example, it is possible that schools that institute drug testing are those in higher crime areas than are those that did not choose to use drug testing. Perhaps the level of drug use in these higher crime communities would have been much higher without these programs than it was with them. 4.7 Hairdressers at risk: a) The response variable is whether or not a woman’s infant had a birth defect. The explanatory variable was whether a woman was a hairdresser. b) This study is an observational study. Women were not randomly assigned to be hairdressers or not – they chose this occupation. c) We cannot conclude that there’s something connected with being a hairdresser that causes higher birth defect rates. It’s possible that there’s a lurking variable. For example, the women from the general population might have had higher incomes, and better health insurance. Better neonatal care might have led
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sol_hw_02 - Solutions Gathering Data 4.5 School testing for...

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