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‘T’ on a graphing calculator
Confidence Intervals…
( ONLY ON TI-84’s and above…To find t* without a table…
Go to 2nd VARS and select
4:invT. Enter in the area or
probability to the left of the
value, df). Then hit Enter.
The area or probability to the left of the value = 1 – upper tail probability (on t-table)
( To calculate a confidence interval, you first go to STAT and then go over to TESTS.
Select 8:TInterval.
You select the method that you are using and fill in the appropriate information.
Then select Calculate.
The result will be the confidence interval, [pic], sx, and n.
[pic]
Hypothesis Tests…
( To calculate a Hypothesis Tests, you first go to STAT and the right arrow twice to select TESTS.
Select 2:T-Test
You select the method that you are using (Stats
instead of raw Data) and fill in the appropriate
information.
Use the down arrow to Enter the hypothesized
mean, sample mean, standard deviation, and
sample size. Select alternate hypothesis.
Then select Calculate.
The Results will include the p-value (p) that
you can then take and compare to α make
your conclusion.
Note: You can also select DATA instead of STATS if you have entered data into L1 instead of the sample mean and standard deviation
PRACTICE:
To find t*:
1) 28%, with n = 20 2) 3.67%, with n = 53
Now go back to the ‘T’ Equations Notes from last class and use the graphing calculator to check your answers OR get more exact answers
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