
Dear R community,
 
I compare mean monthly body temperature between two age classes of turtles overwintering underground. 
 
lm(body_tem ~ Month*Year*Age_Class)
TukeyHSD(aov(body_tem ~ Month*Year*Age_Class, a))
 
The Tukey HSD as well as the planned contrasts method showed significant differences between the two age classes, but insignificant differences between the two age classes at the same levels of months. 
 
In the opposite, using a t-test for comparison of independent means (i.e. without using the ANOVA) it demonstrated insignificant differences between the two age classes. What result is correct?
 
Thanks,
Julia
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