Stats

• If p value < 0.05

  Differences are statistically significant

  Results are not due to chance
• If p value > 0.05

  Differences are not statistically significant

  Results are due to chance
• If t value > critical value


  Reject the null

  Results are statistically significant
• If t value < critical value

  Accept null

  No significant difference in results
• If standard deviation overlaps


  Not statistically different
• If standard deviation doesn't overlap


  Statistically significant
• If standard deviation is large

  then the data is more spread out from the measured value
• If standard deviation is small


  then the data is close to the measured value