The accuracy of a survey depends on four things. First, the size of the
sample (not the proportion of the population sampled). Second, the randomness
of the sample. Third, the response rate (to be sure the respondents are not
self-selected) and, finally, the construction of the questions.
Most professional firms are quite good at controlling these factors and
will provide the information you need to evaluate the surveys. I'm sure an
inquiry to the league will produce the additonal information you need.
73 de Jim
W0UO/5
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