Table 3. Flight aptitude evaluation
t
-test by engineering majors
Group
Obs
Mean
Std. Dev.
95% Conf. Interval
Non-engine
88
89.378
3.189
88.702
90.054
Engineer
20
90.965
3.172
89.480
92.449
Diff
-1.586
-3.1515
-.02158
diff = mean(0) - mean(1)
Ho: diff = 0
t
= -2.009
degrees of freedom = 106
Ha: diff < 0
Pr(T < t) = 0.0235
**
Ha: diff != 0
Pr(|T|>|t|) = 0.047
Ha: diff > 0
Pr(T > t) = 0.976
p
<.05.