Lecture2[1] - Lecture 2 Summarizing Qualitative and...

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Summarizing Qualitative and Quantitative Data 1 STAT 225, Dallas Bateman, Fall 2009 Lecture 2
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Avoiding Bias Confusing wording? If you have to read it more than once to understand what its saying 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 pass a bill outlawing the shipment of oil from Alaska to Russia due to the large death rate of the baby seals? Something really embarrassing that they wouldn’t 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?) STAT 225, Dallas Bateman, Fall 2009 2
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Summarizing Qualitative Data Frequency Distribution Relative Frequency Bar Graphs Pie Charts 3 STAT 225, Dallas Bateman, Fall 2009
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Student IQ Example: IQ Test Scores for 60 Randomly Chosen 5 th Graders 145 139 126 122 125 130 96 110 118 118 101 142 134 124 112 109 134 113 81 113 123 94 100 136 109 131 117 110 127 124 106 124 115 133 116 102 127 117 109 137 117 90 103 114 139 101 122 105 97 89 102 108 110 128 114 112 114 102 82 101 STAT 225, Dallas Bateman, Fall 2009 4
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Frequency Distribution Frequency – the number of occurrences of an event (counts) Distribution – tells us what values a variable takes and how often it takes these values STAT 225, Dallas Bateman, Fall 2009 5
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Frequency Distribution Divide the range of the data into equal-width
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This note was uploaded on 05/19/2011 for the course STAT 225 taught by Professor Martin during the Spring '08 term at Purdue University-West Lafayette.

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Lecture2[1] - Lecture 2 Summarizing Qualitative and...

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