the sign test

• The sign test is used to analyse the difference in scores between related items like the same participant being tested twice
• how to calculate sign test:

  1. the score for condition B is subtracted from condition A to produce the sign of difference (+ or -)
  2. add up the amount of + or -
  3. participants who achieved the same score in condition A and B should be disregarded and deducted from the N value
  4. the S value is the total of the less frequent sign (+ or -)
• If S is equal to or less than the critical value, then S is significant and the null hypothesis is accepted and the alternative hypothesis is rejected at 5% level of certainty