Table 4. Flight simulated instrument flight evaluation
t
-test by age
Group
Obs
Mean
Std. Dev.
95% Conf. Interval
30y below
100
22.416
6.635
21.100 23.733
30y above
30
17.022
9.821
13.355 20.690
diff
5.394
2.3144 8.4739
diff = mean(0) - mean(1)
t
= 3.465
Ho: diff = 0 degrees of freedom =128
Ha: diff < 0
Pr(T<
t
) = 0.9996
**
Ha: diff != 0
Pr(|T|>|
t
|) = 0.0007
Ha: diff > 0
Pr(T>
t
) = 0.0004
p
<.05