COMM291_CLASS4 - COMM 291 202 12 January 2017 CLASS 4...

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COMM 291, 202 12 January 2017 CLASS 4 Chapter 3 - Potential biases (p45 – 47) => response bias o Non-response o Voluntary responses o Self-selection o Convenience sampling o Question phrasing o Answer choices - Pilot test of survey (detect and avoid common mistakes) - Ethics not afterthought o Using stats to mislead/misrepresent intentionally/carelessly => unethical o Subjects treated appropriately Chapter 4 - 3 principles of data analysis o Draw a picture o Draw a picture o Draw a picture - Frequency table o Compute relative frequencies and percentage Category Frequency (Count) Relative Frequency Percentage A 8 0.06 6% B 2 0.01 1% C 28 0.20 20% D 98 0.71 71% E 2 0.01 1% total 138 1 100% o Draw graph § Bar chart § Table -> “diagram” to represent data § Pie chart (DO NOT USE) § Clustered bar chart
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