However, when the data were subsequently plotted, a data entry error was revealed: One runner reported a best 1-mile time of 7 min 30 seconds and also reported relatively short sleep times (average 5 hours per night). When this one data point was removed, the correlation between sleep and 1-mile performance time was negligible (r=-.15, p=.46). Given that 7 min 30 seconds is unexpectedly slow for the population, the data point was rechecked and found to have been mis-entered in the database. Fortunately, the error was caught before publication.
However, when the data were subsequently plotted, a data entry error was revealed: One runner reported a best 1-mile time of 7 min 30 seconds and also reported relatively short sleep times (average 5 hours per night). When this one data point was removed, the correlation between sleep and 1-mile performance time was negligible (r=-.15, p=.46). Given that 7 min 30 seconds is unexpectedly slow for the population, the data point was rechecked and found to have been mis-entered in the database. Fortunately, the error was caught before publication.
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