Cell means (g):
  female vehicle 103.40 (n = 5)
  female drug    116.56 (n = 5)
  male   vehicle 115.32 (n = 5)
  male   drug    133.08 (n = 5)
Separate t-tests in each sex (the reading error):
  male: difference 17.76 g, t = 3.76, p = 0.0056
  female: difference 13.16 g, t = 1.56, p = 0.1583
Pooled t-test ignoring sex: t = 2.72, p = 0.0141
Two-way ANOVA (treatment x sex):
  treatment       F(1, 16) = 10.18, p = 0.0057
  sex             F(1, 16) = 8.62, p = 0.0097
  treatment x sex F(1, 16) = 0.23, p = 0.6414
Effects with 95% CI (g):
  treatment effect, averaged over sexes: 15.46 (5.19 to 25.73)
  treatment effect in females: 13.16 (-1.36 to 27.68)
  treatment effect in males: 17.76 (3.24 to 32.28)
  difference between sexes in the effect (male - female): 4.60 (-15.94 to 25.14)