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Biostatistics & Research · single question

A dental office compares three lasers. Laser 1: CI negative, lower price. Laser 2 (Erbium YAG): CI positive, middle price. Laser 3: CI negative, higher price. Which is most appropriate to recommend?

  1. Laser 1 (negative CI, lower price)
  2. Laser 2 (positive CI, middle price, $1,700)
  3. Laser 3 (negative CI, higher price)
Show answer and explanation

Correct answer: B. Laser 2 (positive CI, middle price, $1,700)

  • A. INCORRECT. A negative confidence interval indicates no demonstrated benefit, so a low price does not justify it.
  • B. CORRECT. Laser 2 shows a positive (significant) result and reasonable cost, making it the evidence-supported choice.
  • C. INCORRECT. Laser 3 lacks demonstrated benefit and costs the most.

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