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[quote user="schlimm"] I think if you had read the remainder of my post, you would note a research cautionary note: Much lower response rates can yield results that are only marginally less valid in terms of demographic representativeness within the range examined than the traditionally higher rates regarded as robust. [/quote] I understand your point.  However, the study was not based on a valid statistical sample and, therefore, the results cannot be projected to the population as a whole.  This, in effect, is what the researchers said. They noted in their topical sentence to the study that what they measured and could report on were the results of the people surveyed.  That is significantly different from saying they gathered their data from a valid statistical sample and, therefore, could project the results to the population as a whole. What we know from the study referred to by Payne is that the Texans who responded to the survey expressed certain views about transportation in Texas, primarily along the I-35 corridor.  Given the poor rate of response, I don't believe it is reasonable to conclude that the respondents are speaking for Texans as a whole.  We don't even know the extent to which the researchers believe that the results of their non-statistical sample reflects the beliefs of the population. They did not go there.
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