Need to know how to use your Texas Instruments graphing calculator for your college math or statistics class? You're in luck... watch this video tutorial to see how to find intervals with a TI-83 graphing calculator.

Confidence intervals for single population means: sigma unknown.

Please note, this example is NOT in your TI workbook.

A random sample of 10 healthy adults yielded a mean temperature of 98.15 degrees F and a standard deviation of 0.66 degrees F. The body temperature of healthy adults are considered to be normally distributed. Find the 99% confidence interval estimate of mu, the mean body temperature of all healthy adults.

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