Questions: What is the purpose of a negative control?

What is the purpose of a negative control?
Transcript text: What is the purpose of a negative control?
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Solution

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The answer is the second one: To provide a point of comparison.

Explanation for each option:

  1. To disprove the experiment: This is incorrect. The purpose of a negative control is not to disprove the experiment but to ensure that the results are due to the variable being tested and not some other factor.
  2. To provide a point of comparison: This is correct. A negative control is used to show what happens in the absence of the experimental treatment, providing a baseline to compare the experimental results against.
  3. To disprove the hypothesis: This is incorrect. While a negative control can help determine if the hypothesis is supported or not, its primary purpose is not to disprove the hypothesis but to validate the experimental setup.
  4. To act as an unknown: This is incorrect. A negative control is not an unknown; it is a known condition where the experimental treatment is not applied, serving as a benchmark for comparison.

Summary: The purpose of a negative control is to provide a point of comparison, ensuring that the experimental results are due to the variable being tested.

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