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#1. Detectives are investigating a crime scene where witnesses reported seeing four people run from a building. All three witnesses independently corroborated this observation, stating they saw four individuals. However, later police evidence conclusively proved that only two people were actually involved. Based on this discrepancy, what quality does the witnesses’ data primarily lack?
This scenario highlights the importance of data accuracy Accuracy refers to the extent to which observed values match the true state or true value of the event In this case the witnesses reported seeing four people but the true number was two Therefore their data lacked accuracy Interobserver agreement IOA was present as all three witnesses agreed on the number but high IOA does not guarantee accuracy Validity as described in the text refers to measuring what one intends to measure the witnesses intended to count people running and they did However if the measurement itself does not reflect the actual event it could be argued that the measurement system is not valid for representing the true state Nevertheless the most direct and undeniable flaw here is the mismatch between the recorded value 4 and the true value 2 which is a failure of accuracy Reliability refers to the consistency of measurement over repeated observations with only one data point described reliability cannot be fully assessed but its not the primary issue here
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