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Table 3 Percentage scores for 2010 and 2012, RLG and statistical significance of the difference between the two years, separated by groups of students and by the parts of the test

From: A study of carpenter apprentices’ spatial skills

Group Part 2010 2012 RLG Significance
Year 0 MR 60.0 70.1 29.3% t[40] =−3.32, p =.002
  PF 61.3 73.9 30.7% t[40] =−3.26, p =.000
  OP 63.0 67.9 20.6% t[40] =−1.27, p =.21
  all 60.9 71.4 27.4% t[40] =−6.11, p =.000
Year 1 MR 60.6 71.8 27.5% t[69] = −5.53, p =.000
  PF 68.8 76.4 27.4% t[69] =−5.31, p =.000
  OP 61.0 69.8 25.6% t[69] =−3.54, p =.001
  all 63.9 73.4 25.8% t[69] =−7.60, p =.000
Year 0 and 1 MR 60.4 71.2 28.2% t[110] =−6.37, p =.000
  PF 66.0 75.5 28.7% t[110] =−8.19, p =.000
  OP 61.7 69.1 23.8% t[110] =−3.49, p =.001
  all 62.8 72.6 26.4% t[110] =−9.79, p =.000