4. SAMPLING AND STRATIFICATION
IMS selected 500 records from the sampling frame at random without
replacement. Upon inspection of the 500 records, IMS discarded four of
them from the sample for the following reasons:
- One record contained unusable garbled information.
- One record referred to a museum that was part of the U.S. Government.
- One record referred to an observatory, which is not within the definition of "museum".
- one record referred to the same institution as another record among the 500.
IMS selected four more records from the sampling frame as described
above. Upon inspection, it did not find cause to discard any of these
four records from the sample.
IMS inspected the names of the 500 institutions in the sample to
identify those that appeared to be minority museums. IMS identified 21
of the 500 records in the sample as apparent minority museums.
IMS selected additional records from the sampling frame, as described
above, and discarded those that did not appear to be minority museums,
until it had selected an additional 24 apparent minority museums. This
required selecting an additional 794 records.
Thus, the sample consisted of 45 institutions in the Apparent Minority
stratum, 479 institutions in the Others stratum, and four records that
IMS selected from the sampling frame and discarded.
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