Intended for healthcare professionals

Endgames Statistical question

t tests

BMJ 2008; 337 doi: (Published 17 September 2008) Cite this as: BMJ 2008;337:a198
  1. John Fletcher, clinical epidemiologist
  1. 1BMJ, London WC1H 9JR
  1. jfletcher{at}

    Twenty four office workers are chosen randomly from an office. Their heights are measured when they arrive at work in the morning, and again before they go home the same evening. What statistical test would best be used to test the hypothesis that their morning heights are no different from their evening heights?

    • a) Two sample t test

    • b) One sided t test

    • c) One sample t test

    • d) Paired t test


    d—When two measurements are made for each person the average difference is best assessed with a paired …

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