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A Sample of Employers for the Statewide Evaluation <br /> In addition to using a consistent measurement tool like the state-provided survey, a good evaluation <br /> design is essential to support evaluation conclusions. Good design requires a valid sample of <br /> employers who are willing to do surveys in the base year to establish pre-program values for VMT <br /> per employee and SOV rates. <br /> A random sample for this evaluation would be drawn after employers are grouped by size, type of <br /> business, location, and whether there is an existing TDM program. Based on the diversity in the <br /> group being evaluated, an appropriate sample size would be about 20 percent of the entire group, <br /> or about 500 employers statewide. <br /> In order for an evaluation sample to be statistically valid, it must be drawn randomly from the <br /> population as a whole or from large groups in the population. This minimizes bias that would <br /> otherwise be introduced if certain types of employers were over- or under-represented in the sample. <br /> Only a statistically valid sample can be generalized to the entire population of employers affected by <br /> this legislation. <br /> A survey will, however, create additional costs for some employers. Therefore, in counties where <br /> base year values are not determined by surveys, the state will request survey information from all <br /> employers already doing surveys for other purposes. <br /> Where necessary, the State will supplement this pool of information with a random sample of <br /> employers that will be asked to participate in a voluntary survey for purposes of evaluating the <br /> impacts of the CTR Law. This information also will be very useful to employers in designing their <br /> own programs. The State will provide as much technical assistance as is possible to those <br /> employers. Technical assistance will include providing surveys, assistance, training in distribution <br /> and collection of surveys, and centralized processing. If employers refuse to participate, the State <br /> will redraw employers for the evaluation sample, until the sample size reaches 500 employers. <br /> The Task Force strongly encourages employers to cooperate with the evaluation effort, since the <br /> information provided will be very valuable--to the Legislature, the affected employers, and the <br /> general public--in making future decisions about the law. <br /> 19 <br />