User Manual


k


Lower 

Upper 

Z 

Lower, Upper = o + Z( /2) · σ/
'
n
α
Z 

Lower, Upper = (o
1
– o
2
) + Z( /2) σ /n
1
+ σ /n
2
2
1
2
2
α

Z 

Lower, Upper = x/n + Z( /2) 1/n · (x/n · (1 – x/n))
α


Z 

Lower, Upper = (x
1
/ n
1
– x
2
/ n
2
)
+ Z( /2) (x
1
/ n
1
· (1 – x
1
/ n
1
))/ n
1
+ ( x
2
/ n
2
· (1 – x
2
/ n
2
))/ n
2
α


t 

Lower, Upper = o + t
n−1
( /2) · s
x
/'n
α


t 


Lower, Upper = (o
1
– o
2
) + t
n
1
+n
2
−2
( /2) s
p
2
(1/n
1
+ 1/n
2
)
s
p
= ((n
1
– 1)s
x
1
2
+ (n
2
– 1)s
x
2
2
)/(n
1
+ n
2
– 2)
α


t 


Lower, Upper = (o
1
– o
2
) + t
df
( /2) s
x
1
2
/ n
1
+ s
x
2
2
/ n
2
df = 1/(C
2
/( n
1
– 1) + (1 – C)
2
/( n
2
– 1))
α
C = (s
x
1
2
/ n
1
)/(s
x
1
2
/ n
1
+ s
x
2
2
/ n
2
)


α  α − < 
Z  α  α 

t
df
 α t  df 
