Casio ALGEBRA FX2.0 Advanced Statistics Examples 2 Manuel d'utilisateur télécharger pdf (Page 10)

examples

Example A paint manufacture wants to determine the average drying time of a

new interior wall paint. If for 12 test areas of equal size he obtained a

mean drying time of 66.3 minutes and a standard deviation of 8.4

minutes, construct a 95% confidence interval for the population mean

Procedure

1 m STAT2

2 4(INTR) c(T)b(1-Smpl)

3 2(VAR) c

.jfw

gg.dw

i.ew

bcw

1(None)c

4 1(CALC)

Result Screen

Thus, the 95% confidence interval for

becomes 61.0<

<71.6 .

1 2 ... 5 6 7 8 9 10 11 12 13 14

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Casio ALGEBRA FX2.0 Advanced Statistics Examples 2 Manuel d'utilisateur Page 10