Texas Instruments TI-84 - Manual (Page 378)

Chapter 13: Inferential Statistics and Distributions 375
invNorm( invNorm( invNorm( invNorm(
invNorm( computes the inverse cumulative normal distribution function for a given area
under the normal distribution curve specified by mean m and standard deviation s. It
calculates the x value associated with an area to the left of the x value. 0 
area
 1 must
be true. The defaults are m=0 and s=1.
invNorm(area[,
m
,
s
])
invT( invT( invT( invT(
invT( computes the inverse cumulative Student-t probability function specified by Degree
of Freedom, df for a given Area under the curve.
invT(area,df)