Casio ALGEBRA FX2.0 Advanced Statistics Examples 2 Manuel d'utilisateur télécharger pdf (Page 4)

examples

Example Construct a 94% confidence interval for the difference between the

mean lifetimes of two kinds of light bulbs(

2), given that random

sample of 40 light bulbs of the first kind lasted on the average for 418

hours of continuous use and 50 light bulbs of the second kind lasted

on the average for 402 hours of continuous use. The population

standard deviations are known to be

1 = 26 and

2 = 22.

Procedure

1 m STAT2

2 4(INTR) b(Z)c(2-Smpl)

3 2(VAR) c

.jew

cgw

ccw

ebiw

eaw

eacw

faw

1(None)c

4 1(CALC)

Result Screen

Thus, the 94% confidence interval for

becomes 6.3<

2<25.7.

1 2 3 4 5 6 7 8 9 ... 13 14

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Casio ALGEBRA FX2.0 Advanced Statistics Examples 2 Manuel d'utilisateur Page 4