Statistics

• what does Spearman's Rank determine?

  if there is a significant correlation between to variables
• what does Chi Squared determine?

  if there is a significant difference between observed and expected values
• what does a paired and an unpaired t-test determine?

  if there is a significant difference between the mean values of 2 samples
• how do you work out D.O.F in Spearman's Rank?

  n - 2
• how do you work out D.O.F in Chi squared?

  n - 1
• how do you work out D.O.F in a paired t-test?

  n - 1
• how do you work out D.O.F in an unpaired t-test?

  n1 + n2 - 2
• what is the writing frame for writing a conclusion?

  • the calculated (rs/X2/t) value ....... is (greater/less than) the critical value of ....... for (n/D.F.) ...... and ...... % significance level
  • therefore, the null hypothesis must be (accepted/rejected)
  • there (is/isn't) a significant (correlation/difference) between ...... and .......
  • there is a (less/greater than) ....... % probability that this result happened by chance