• MichelsonDownload .TXT file Open in Data Desk ?Link
  • Methods: Confidence Intervals for Means
  • Source: Stigler, Stephen M. (1977). Do Robust Estimators Workwith Real Data? The Annals of Statistics 5:4, 1075. Used by permission.
  • Number of Cases: 100
  • Story:

    In 1879, A. A. Michelson made 100 determinations of the velocity
    of light in air using a modification of a method proposed by the French
    physicist Foucault. The data are given here as reported by Stigler.
    The measurements are derived from sets of often widely disparate
    numbers of observations. The numbers are in km/sec, and have had
    299,000 subtracted from them. The currently accepted “true”
    velocity of light in vacuum is 299,792.5 km/sec. Stigler has
    applied the corrections used by Michelson and reports that the
    “true” value appropriate for comparison to these measurements
    is 734.5. Each trial may be a summary of several experimental


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