User Manual

27
examples
Example In a random sample of size n = 20 from a normal population
with the standard deviation σ = 15 and the mean
oo
oo
o = 64.3,
construct a 95% confidence interval for the population mean µ .
Procedure
1 m STAT2
2 4(INTR) b(Z)b(1-Smpl)
3 2(VAR) c
.jfw
bfw
ge.dw
caw
1(None)c
4 1(CALC)
Result Screen
Thus, the 95% confidence interval for µ becomes 57.7< µ <70.9 .