HP Prime Graphing Calculator - Manual (Page 260)

256 Inference app
One-Sample T-Interval
Menu name T-Int: 1 
This option uses the Student’s t-distribution to calculate a
confidence interval for , the true mean of a population,
for the case in which the true population standard
deviation, , is unknown.
Inputs The inputs are:
Results The results are:
Two-Sample T-Interval
Menu name T-Int: 
1
– 
2
This option uses the Student’s t-distribution to calculate a
confidence interval for the difference between the means
of two populations, 
1
– 
2
, when the population
standard deviations, 
1
and 
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 
Upper Upper bound for 