Casio STAT 2 Manual page 98

Statistical calculation (stat) software for the algebra fx2.0

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

µ .

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 µ becomes 61.0< µ <71.6 .

examples