Texas Instruments TI-Nspire CX User Manual page 35

Press
4: Statistics 4:Stat
Tests"
2:t-test
choose "Stats" this time
National standard deviation
In this case our hypothesis is that
our sample (Delta region) is
significantly lower than the
Pick column for results and the [OK]
These results would be
written: "A significant
difference (p<.000)was found
in the mean age for mother
giving birth to their first child in
the Arkansas Delta region than
the national average. t (199)
= -18.49, p <.000. With the
mean for the nation being 25.1
and the mean for the delta
region of Arkansas being
21.7."
Means are usually given in
addition to the t scores
Sample mean
National mean
N in our sample
TI-Inspire manual 32