Table 9. Actural instrument flight evaluation
t
-test by engineering majors
Group
Obs
Mean
Std. Dev.
95% Conf. Interval
Non-engine
80
17.082
5.308
15.901 18.264
Engineer
50
16.445
7.065
14.437 18.452
Diff
0.637
-1.517 2.7928
diff = mean(0) - mean(1)
t
= 0.5855
Ho: diff = 0 degrees of freedom = 128
Ha: diff < 0
Pr(T<
t
) = 0.7204
**
Ha: diff != 0
Pr(|T|>|
t
|) = 0.559
Ha: diff > 0
Pr(T>
t
) = 0.279
p
<.05