Table 23. Summary of Foreign and Domestic Waterborne Commerce, by Type of Traffic and Commodity, Calendar Year 1953-Continued The sampling error is 7 percent. The sampling error is 17 percent. The sampling error is 31 percent. NOTE: Effective July 1, 1953 export tonnages of $100-499 valued shipments were estimated based on a 10% sample. Except for the items footnoted above, the error due to sampling did not exceed one percent. |