Calculators Using TI-89 for confidence intervals

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SUMMARY

The TI-89 calculator can be utilized to compute phi(z) for confidence intervals using the formula phi(z) = 1/2 (1 + erf(z / sqrt(2))). Users have reported difficulties accessing the error function (erf) directly on the TI-89, as it is not built-in. To calculate phi(4.5), for example, one must rely on external resources such as PDF manuals available online that provide guidance on using the TI-89 for probability calculations.

PREREQUISITES
  • Understanding of confidence intervals and their statistical significance
  • Familiarity with the error function (erf) and its applications in statistics
  • Basic knowledge of the TI-89 calculator's functions and capabilities
  • Access to TI-89 manuals or resources for advanced functions
NEXT STEPS
  • Research how to implement the error function (erf) on the TI-89 calculator
  • Explore the Normal CDF function and its parameters for confidence interval calculations
  • Download and review TI-89 PDF manuals focused on probability and statistics
  • Learn about alternative calculators or software for statistical analysis, such as R or Python's SciPy library
USEFUL FOR

Students, educators, and professionals in statistics or data analysis who are using the TI-89 calculator for confidence interval calculations and require a deeper understanding of its functions.

jaejoon89
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How do you use a TI-89 to get phi(z) when you do a confidence interval, i.e.

phi(z) = 1/2 (1 + erf(z / sqrt(2)))

The Normal CDF function has lower and upper values so I don't see how I can do it, and erf(z) doesn't do anything when I enter it so it must not be built in. Integrating the error function doesn't work either, I think because it's nonstandard.

ex - using TI 89 to calculate phi(4.5) = .999997
 
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Google search Ti-89 and probability. There are usually in pdf format books by Ti on specific topics you can download and/or print.
 

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