Sign Test

• • Data will be given in the form of +, -
  • If data from one condition is more than mark as +, less -
  • Same number/result, data is ignored
• • Add up + and -
  • We take the less frequent sign and call this S
  • S is the calculated value
• • Compare calculated value with critical value given
  • Use 0.05 significance unless said otherwise to find the value of 'N'
  • Consider whether test is one-tailed (directional) or two-tailed (non-directional)
• • The calculated value of S must be equal to or less than the critical value at the 0.05 level of significance
• • No significance means the null hypothesis must be accepted and the alternative hypothesis must be rejected
  • Therefore there is not enough evidence to suggest there is a significant difference between variables tested
• • Significance means the alternative hypothesis must be accepted and the null hypothesis must be rejected
  • Therefore there is enough evidence to suggest there is a significant systematic difference between variables tested