Lecture 2 Notes[1]

Lecture 2 Notes[1] - STAT 225 Lecture 2 Notes Summarizing...

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STAT 225 Lecture 2 Notes Summarizing Qualitative and Quantitative Data Avoiding Bias How a question is asked can have an effect on how a respondent responds. Sources of Bias Confusing wording If you have to read a question more than once to understand what it is asking then your answer may be not an accurate description of your true belief(s). Asking something no one would remember What were you doing between 8 and 8:15 on Tuesday November 5th 2005? Leading the question to a certain answer Would you advocate a recycling plan that would help reduce landfill mass? Would you support a federal bill outlawing off-shore drilling in the Gulf of Mexico? Asking embarrassing or personal questions that very few would answer honestly Do you always wash your hands after using the restroom? Have you ever cheated on a test? Have you ever done drugs? Date sensitive question How safe do you feel at Purdue University? (What if this was asked right after the Virginia Tech shootings?)
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Summarizing Qualitative Data o Frequency Distribution o Relative Percent Frequency o Bar or Column Graphs o Pie Charts Frequency : The number of occurrences of an event. Frequency Distribution : Tells us what values a variable takes and how often it takes these values. Categorical Variables Bar graphs or pie charts Ex. Place of Origin (From Day 1 Survey) Place Frequency IN 14 IL 4 FL 2 CA 2 UT 1 TX 1 OH 1 WV 1 NY 1 AZ 1 China 6 17% 41% 6% 12% 6% 3% 3% 3% 3% 3% 3% Place of Origin China IN FL IL CA UT TX OH WV NY
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Ex. 40 randomly selected Purdue undergraduates reported the number of siblings they have. Ex. Class Level (From Day 1 Questionnaire)
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Lecture 2 Notes[1] - STAT 225 Lecture 2 Notes Summarizing...

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