HP 39gII

Inference app 117
One-Sample T-Interval
Menu name T-int: 1 μ
This option uses the Student’s t-distribution to calculate a
confidence interval for μ, the true mean of a population,
for the case in which the true population standard
deviation, σ, is unknown.
Inputs The inputs are:
Results The results are:
Two-Sample T-Interval
Menu name T-int: μ
1
– μ
2
This option uses the Student’s t-distribution to calculate a
confidence interval for the difference between the means
of two populations, μ
1
– μ
2
, when the population
standard deviations, σ
1
and σ
2
, are unknown.
Field
name
Definition
Sample mean.
s Sample standard deviation.
n Sample size.
C Confidence level.
x
Result Description
C Confidence level.
DF Degrees of freedom.
Critical T Critical values for T.
Lower Lower bound for μ.
Upper Upper bound for μ.