Using Your TI83/84 Calculator for Hypothesis Testing:
The OneSample
t
Test
Dr. Laura Schultz
The onesample
t
test is used to test hypotheses regarding population means.
This handout will take
you through one of the examples we will be considering during class.
Consult your lecture notes
for more details regarding the noncalculatorrelated aspects of this specific hypothesis test.
Researchers at the University of Maryland recorded body temperatures from a random sample
of 93 healthy adults.
They obtained a sample mean of
¯
x
= 98
.
12
℉
, with a standard deviation
of
s
= 0.65
℉
.
Use this sample data to test the hypothesis that the mean (
μ
) body temperature
of all healthy adults is actually less than 98.6
℉
.
Working from Summary Statistics
1. Before you can proceed with entering the data into your calculator, you will need to symbolize
the null and alternative hypotheses.
For this example, let’s define
μ
as the mean body tempera
ture of all healthy adults.
Then, we can symbolize our null hypothesis (
H
0
) as
μ
= 98.6
℉
and
our alternative hypothesis (
H
1
) as
μ
< 98.6
℉
.
2. Press
S
and use
>
to scroll right to the
TESTS
menu.
Then, scroll
down to
2:TTest
and press
e
.
3. Your calculator will prompt you for the following information:
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 Fall '07
 Jerome
 Statistics, Statistical hypothesis testing, healthy adults, Dr. Laura Schultz

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