The survey had a response rate of approximately 83 percent. A few visitors volunteered to complete the questionnaire. They were permitted to do so, and any comments they made on their questionnaires were provided to the museum, but those questionnaires were not tallied and included with data from the random sample of visitors. Questions answered by the sample of 1,472 exhibition visitors are subject to a sampling error of plus or minus approximately 4 percentage points at the 95 percent level of confidence. This means that in 95 out of 100 samples like the one used here, the results obtained should be no more than 4 percentage points above or below the figure that would be obtained by interviewing all visitors to the Faberg exhibitions.
Surveys are also subject to errors from sources other than sampling.
While every effort is made to identify such errors, they are often difficult or impossible to measure. The sample procedures for this survey were designed by Dr. Scott Keeter of the Survey Research Laboratory at Virginia Commonwealth University and Dr. Michael Pratt, Director of The Virginia Center for Urban Development.