Why does a low response rate weaken a study?

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Question

Why does a low response rate weaken a study?

Accepted Answer

Because those who did not respond may differ systematically from those who did — Award 1 mark. The achieved sample may no longer reflect the population's structure. Validity concerns whether items measure the right thing and is a separate matter.

Answer

Because it means the topic was uninteresting

Answer

Because those who did not respond may differ systematically from those who did

Answer

Because percentages cannot be calculated

Answer

Because it makes the questionnaire items invalid

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