41.
Which of the following is considered as a tentative and testable statement of the possible relationship between two or more events being investigated?

43.
Collection of solid observation evidence, accurate description and measurement, precise definition, controlled observation, and repeatable results, is called . . . . . . . .

45.
Which of the following statements about 'cross-sectional studies' is correct?

46.
Those conditions or factors to be excluded from possible influence on the outcome of a controlled experiment, are called . . . . . . . .

47.
In stratified random sampling

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