Compared with a longitudinal survey, an important advantage of a cross-sectional survey is

a. the information is collected at several points in time.
b. the data may be collected more quickly.
c. the size of the sample needed is smaller.
d. All of these are true.


B

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Most children pass through the six stages of spelling development as they mature across a certain interval of grade levels. What is that interval?

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A. Homogenous variance B. Systematic variation C. Residual variance D. Unsystematic variation

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