Bureau of Transportation Statistics (BTS)
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TABLE 2 - Minimum Sample Size Requirements to Detect a Range of Target Reductions

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Target reduction Mode of travel
Car Bus Rail
0.50% 8 9 1
1.00% 2 3 1
1.50% 1 1 1
2.00% 1 1 1
2.50% 1 1 1
3.00% 1 1 1