Table 3. Flight simulated instrument flight evaluation
t
-test by engineering majors
Group
Obs
Mean
Std. Dev.
95% Conf. Interval
Non-engine
80
21.472
6.919
19.932 23.012
Engineer
50
20.691
9.064
18.114 23.267
Diff
0.781
-2.004 3.5674
diff = mean(0) - mean(1)
t
= 0.5849
Ho: diff = 0 degrees of freedom =128
Ha: diff < 0
Pr(T<
t
) = 0.7100
**
Ha: diff != 0
Pr(|T|>|
t
|) = 0.579
Ha: diff > 0
Pr(T>
t
) = 0.290
p
<.05