t-TEST

• WHAT DOES THE t-TEST TEST FOR?

  significant difference
• TYPE OF DATA USED IN t-TEST?

  • same variable across two data sets
  • mean
• NULL HYPOTHESIS OF t-TEST?

  there is no significant difference between X1 and X2
• DEGREES OF FREEDOM FOR t-TEST?

  n1 + n2 - 2
• HOW TO CARRY OUT A STATISTICAL TEST?

  1. Type of data -> select test
  2. Null hypothesis
  3. Calculate test statistic
  4. Get critical value from degrees of freedom and 5% significance
  5. Conclusion
• CONCLUSION FOR t-TEST IF TEST STATISTIC SMALLER THAN CRITICAL VALUE?

  1. t < CV
  2. Accept null hypothesis
  3. No significant difference between X1 and X2
  4. With 5% chance of error
• CONCLUSION FOR t-TEST IF TEST STATISTIC BIGGER THAN CRITICAL VALUE?

  1. t > CV
  2. Reject null hypothesis
  3. Significant difference between X1 and X2
  4. With 5% chance of error