HP 40g hp 39g & 40g_user's manual_English_E_pdfbpia5212.pdf - Page 130
Confidence intervals
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Confidence intervals The confidence interval calculations that the HP 39G/40G can perform are based on the Normal Z-distribution or Student's t-distribution. One-Sample Z-Interval Menu name Inputs Z-INT: 1 µ This option uses the Normal Z-distribution to calculate a confidence interval for µ, the true mean of a population, when the true population standard deviation, σ, is known. The inputs are: Field name Definition x Sample mean. σ Population standard deviation. n Sample size. C Confidence level. Results The results are: Result Critical Z µ min µ max Description Critical value for Z. Lower bound for µ. Upper bound for µ. 9-16 Inference aplet
9-16
Inference aplet
Confidence intervals
The confidence interval calculations that the HP 39G/40G can
perform are based on the Normal Z–distribution or Student’s
t–distribution.
One–Sample Z–Interval
Menu name
Z–INT: 1
μ
This option uses the Normal Z–distribution to calculate a
confidence interval for
μ
, the true mean of a population, when
the true population standard deviation,
σ
, is known.
Inputs
The inputs are:
Results
The results are:
Field name
Definition
Sample mean.
σ
Population standard deviation.
n
Sample size.
C
Confidence level.
x
Result
Description
Critical Z
Critical value for Z.
μ
min
Lower bound for
μ
.
μ
max
Upper bound for
μ
.