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Author:
mary daunis

to illustrate use of TI graphing calculator for normal distribution calculations including probability density, cumulative probability values, and inverse normal functions

This series of videos shows how to use the following commands with the TI83/84 graphing calculator:

- normalpdf(LB, UB, mean, sd)
- normalcdf(LB, UB, mean, sd)
- invNorm(left cumulative area, mean, sd)

Tutorial

This video shows how to find the area to the left of x = 85 for a normal distribution with mean = 100 and standard deviation = 15 using the TI83/84 graphing calculator.

Source: itsallmine©

This video shows how to use the TI graphing calculator to find the area between 85 and 115 for a normal distribution with mean 100 and sd 15.

Source: itsallmine©

This video shows how to use the TI graphing calculator to find the area on the right of x = 115 for a normal distribution with mean 100 and sd 15.

Source: itsallmine©

This video shows how to find a z score when given an area value of 0.98. Using the TI, we must know the area to the left of the unknown z score: area must be expressed as left cumulative area to use the function invNorm(area, mean, sd). As usual, the mean and sd are optional entries for a standard normal distribution.

Source: itsallmine©

Use the TI to find the z score when given a right side area. First, use the rule of complements to find the area to the left and then use invNorm(area, mean, sd).

Source: itsallmine©