Technical Report Documentation Page

Study Design

Sample Construction

Screening to Determine Household Eligibility

Selection of Respondent Within Household

Young Adult Over-Sample

Initial Contact

Spanish Language Interviews

Refusal Conversion

Field Outcomes

Sample Weighting

Precision of Sample Estimates

Estimating Statistical Significance

Comparisons Between Samples

REFERENCES

APPENDIX A1: ENGLISH LANGUAGE QUESTIONNAIRE VERSION (pdf)

APPENDIX A2: ENGLISH LANGUAGE QUESTIONNAIRE VERSION (pdf)

APPENDIX B1: SPANISH LANGUAGE QUESTIONNAIRE VERSION (pdf)

APPENDIX B2: SPANISH LANGUAGE QUESTIONNAIRE VERSION (pdf)

FIGURES AND TABLES

Figures

Figure 1. Within Household Selection Procedure: Adult Cross-Section

Figure 2. Within Household Selection Procedure: Young Adult Over-Sample

Figure 3. Refusal Conversion Script

Figure 4. Sample Disposition Categories

Figure 5A. SPSS Program for Assigning Weights Version 1

Figure 5B. SPSS Program for Assigning Weights Version 2

Tables

Table 1. Population Aged 16 and Older by NHTSA Region: 2003 Projections for National Cross-Section Survey of 4,500

Table 2. Population and Expected Sample Distribution

Table 3. Sample Disposition - Version 1, Seat Belt Usage Issues: 2003

Table 4. Sample Disposition - Version 2, Child Safety Seat Issues: 2003

Table 5. Expected Sampling Error (Plus or Minus) At the 95% Confidence Level (Simple Random Sample)

Table 6. Design Effect on Confidence Intervals for Sample Estimates Between Disproportionate Sample Used in Occupant Protection Survey and a Proportionate Sample of Same Size

Table 7. Pooled Sampling Error Expressed as Percentages for Given Sample Sizes (Assuming P=Q)