23 CFR 1340.10 - Submission and approval of seat belt survey design.
(a)Contents: The following information shall be included in the State's seat belt survey design submitted for NHTSA approval:
(1)Sample design. The State shall-
(iv) Define what stratification was used at each stage of sampling and what methods were used for allocation of the sample units to the strata;
(vi) List all observation sites and their probabilities of selection;
(vii) Explain how the sample sizes were determined, as provided in § 1340.5(d);
(ix) Identify the name and describe the qualifications of the State survey statistician meeting the requirements in § 1340.8(c).
(2)Data collection. The State shall -
(i) Define an observation period;
(iv) Describe the data recording procedures; and
(v) Specify the number of observers and quality control monitors.
(3)Estimation. The State shall -
(i) Describe how seat belt use rate estimates will be calculated;
(ii) Describe how variances will be estimated, as provided in § 1340.9(g);
(iii) Specify imputation methods, if any, that will be used, as provided in § 1340.9(c);
(v) Specify the procedures to be followed if the standard error exceeds 2.5 percentage points, as required in § 1340.5(g).
(b)Survey design submission deadline. For calendar year 2012, States shall submit proposed survey designs to NHTSA for approval no later than January 3, 2012. Thereafter, States should submit survey designs for NHTSA approval as specified in § 1340.11.