Figure 7: Shewhart Chart of Standardized Residuals of Late Arrivals Series: September 1987-February 2002

Figure 7: Shewhart Chart of Standardized Residuals of Late Arrivals Series: September 1987-February 2002

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Figure 7: Shewhart Chart of Standardized Residuals of Late Arrivals Series: September 1987-February 2002. If you are a user with disability and cannot view this image, use the table version. If you need further assistance, call 800-853-1351 or email answers@bts.gov.

Note: The upper and lower grid lines are two standard deviations away from the mean.