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07:24 May 27, 2008 |
English language (monolingual) [PRO] Social Sciences - Mathematics & Statistics | |||||||
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| Selected response from: luskie Local time: 09:20 | ||||||
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SUMMARY OF ALL EXPLANATIONS PROVIDED | ||||
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4 +2 | biased |
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4 | some members quit, not in a natural, random way |
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nonrandom disappearance of certain biased Explanation: this means that the disappeared subjects did not disappea regardless of their characteristcs - they were for example more males than females, or the oldest or the youngest ones, etc. - for this reason, after these defeats, the control group characteristics were biased (a bias being a systematic error), i.e. they were no more randomly ditributed - hence the control group was no more comparable with the experimental or treatment group |
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17 mins confidence:
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