Essay

Recall and describe the medical diagnosis illustration used to explain the difference between a Type I error and a Type II error. In your description, define what each error represents and state the specific pregnancy-related analogy associated with each.

Question: Recall and describe the medical diagnosis illustration used to explain the difference between a Type I error and a Type II error. In your description, define what each error represents and state the specific pregnancy-related analogy associated with each.

Sample answer: A Type I error is a false positive, which occurs when a researcher claims to detect a condition that does not actually exist. In the medical illustration, this is akin to a doctor examining a male patient and incorrectly declaring, 'You are pregnant.' A Type II error is a false negative, which occurs when a researcher fails to detect a condition that is genuinely present. In the medical illustration, this is akin to a doctor examining a visibly pregnant female patient and incorrectly concluding, 'You are not pregnant.'

Key points:

  • A Type I error represents a false positive where a condition is incorrectly claimed to exist.
  • The medical analogy for a Type I error is a doctor declaring a male patient pregnant.
  • A Type II error represents a false negative where a genuinely present condition is not detected.
  • The medical analogy for a Type II error is a doctor declaring a visibly pregnant female not pregnant.

Rubric: To receive full credit, the response must: 1) Correctly define a Type I error as claiming to detect a condition that does not exist (false positive). 2) Recall the specific analogy for Type I error (telling a male patient he is pregnant). 3) Correctly define a Type II error as failing to detect a condition that is genuinely present (false negative). 4) Recall the specific analogy for Type II error (telling a visibly pregnant female she is not pregnant).

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Updated 2026-05-27

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KPU

Research Methods in Psychology - 4th American Edition @ KPU

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