HP Prime Graphing Calculator - Manual (Page 576)

570 Programming in HP PPL
Pooled Determine whether or not the samples are pooled for tests
or intervals using the Student’s T-distribution involving two
means. From the Numeric view, set the value of Pooled.
In a program, type:
0  Pooled—for not pooled (default).
1  Pooled—for pooled.
s
1
Sets the sample standard deviation for a hypothesis test or
confidence interval. For a test or interval involving the
difference of two means or two proportions, sets the
sample standard deviation of the first sample. From the
Numeric view, set the value of s
1
.
In a program, type:
 s
1
s
2
For a test or interval involving the difference of two means
or two proportions, sets the sample standard deviation of
the second sample. From the Numeric view, set the value
of s
2
.
In a program, type:
 s
2

1
Sets the population standard deviation for a hypothesis
test or confidence interval. For a test or interval involving
the difference of two means or two proportions, sets the
population standard deviation of the first sample. From the
Numeric view, set the value of

1
.
In a program, type:


1

2
For a test or interval involving the difference of two means
or two proportions, sets the population standard deviation
of the second sample. From the Numeric view, set the
value of

2
.
In a program, type:


2
n
n
n
n