The panel in a longitudinal study
a. is a fixed sample of elements.
b. has periodic additions to replace drop outs.
c. has members that are measured repeatedly.
d. has periodic additions to maintain representativeness.
e. All of the above are true of the panel in a longitudinal study.
Question 2
The following statement best describes the sample used in which type of descriptive design? We will use a carefully selected sample, selection being based on household size, income level, and television viewing patterns. We must also be concerned with the stability of the sample elements, in order to ensure repeated availability for measurement.
a. Advertising evaluation design
b. Longitudinal design
c. Time series design
d. Latitudinal design
e. Cross sectional design
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