Distinguish between the physical description and the semantic description of an attribute domain
What will be an ideal response?
The physical description of an attribute defines the data type, data length, and other data value constraints, and thus indicates specifications for the storage and processing of the attribute. The semantic description of the attribute indicates the logical meaning of the attribute in the users' environment, and thus the semantic description differentiates between attributes having the same physical description.
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A researcher does not have the resources or time to do a probability sample. She wants to do a convenience sample, but she also wants to make sure that all ethnicities are fairly represented in her sample. What kind of sampling would you recommend to her?
a. census sampling. b. convenience sampling. c. judgment sampling. d. quota sampling e. cluster sampling.
Which of the following sectors would NOT be considered to be part the service industry?
A) hotel B) insurance C) banking D) real estate E) chemicals