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Inference aplet 11-15
Results The results are:
Confidence intervals
The confidence interval calculations that the HP 40gs can
perform are based on the Normal Z-distribution or
Student’s t-distribution.
One-Sample Z-Interval
Menu name Z-INT: μ 1
This option uses the Normal Z-distribution to calculate a
confidence interval for m, the true mean of a population,
when the true population standard deviation, s, is known.
Inputs The inputs are:
Result Description
Test T T-Test statistic.
Prob Probability associated with the T-Test
statistic.
Critical T Boundary values of T associated with
the α level that you supplied.
Field
name
Definition
Sample mean.
σ Population standard deviation.
n Sample size.
C Confidence level.
x
hp40g+.book Page 15 Friday, December 9, 2005 1:03 AM