Sign test

• Determines whether a hypothesis should be rejected or accepted
• Determines whether differences are statistically significant or simply due to chance
• 1. State the hypotheses- both the alternative and null hypothesis
• 2. Record the data and work out the sign- negative if the value has decreased, positive if it has increased
• If the value has stayed the same, it will be ignored and the number of participants adjusted to exclude it
• 3. Find the calculated value for the sign test
• The calculated value for the sign test is the number of times the less frequent sign occurs
• 4. Find the critical value of S- use the calculated N value and p is less than, or equal to, 0.05
• 5. State the conclusion referring back to the hypothesis, mentioning the IV and DV