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Manipulation of independent variables in order to test causal relationships is unacceptable from a scientific point of view.
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Q15: Primary data are more important than secondary
Q19: Scientific investigation is characterized by a good
Q20: A paired samples t-test is used to
Q21: Qualitative data can come from a wide
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Q29: A null hypothesis (H<sub>0</sub>)is a hypothesis set
Q51: Regarding good phone techniques,when screening calls for