Table 7. Flight simulated instrument flight evaluation
t
-test by regidence
Group
Obs
Mean
Std. Dev.
95% Conf. Interval
Seoul
30
21.261
9.142
17.847 24.675
Province
100
21.145
7.387
19.679 22.611
Diff
0.444
-3.105 3.3367
diff = mean(0) - mean(1)
t
= 0.071
Ho: diff = 0 degrees of freedom =128
Ha: diff < 0
Pr(T<
t
) = 0.528
**Ha: diff != 0
Pr(|T|>|
t
|) = 0.943
Ha: diff > 0
Pr(T>
t
) = 0.471