Question: 1a) What is the advantage that a constant sum scale has over simple 7-point scales? 1b) What is the difference between external and internal validity?

1a) What is the advantage that a constant sum scale has over simple 7-point scales? 1b) What is the difference between external and internal validity? 1c) What is the difference between a screener question and a qualifying question? Which one appears first in the questionnaire? Why?

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