Pvalues with the Ti83/Ti84
Note
:
The majority of the commands used in this handout can be found under the DISTR
menu which you can access by pressing [2
nd
] [VARS].
You should see the following:
NOTE
:
The calculator does not have a key for infinity (
∞
).
In some cases when finding
a pvalue we need to use infinity as a lower or upper bound.
Because the calculator does
not have such a key we must use a number that acts as infinity.
Usually it will be a
number that would be “off the chart” if we were to use one of the tables.
Please note this
in the following examples.
Ztable pvalues:
use choice 2: normalcdf(
1.
NOTE: Recall for the standard normal table (the ztable) the zscores on the table
are between –3.59 and 3.59.
In essence for this table a zscore of 10 is off the
charts, we could use 10 to “act like” infinity.
a. Lefttailed test (H1:
µ
< some number).
The pvalue would be the area to the left of the test statistic.
Let our test statistics be z = 2.01.
The pvalue would be P(z <2.01) or
the area under the standard normal curve to the left of z = 2.01.
Notice that the pvalue is .0222.
We can find this value using the Normalcdf feature of the calculator found
by pressing [2
nd
] [VARS] as noted above.
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View Full DocumentThe calculator will expect the following: Normalcdf(lowerbound,
upperbound).
Try typing in: Normalcdf(10, 2.01) , after pressing
[ENTER] you should get
the same pvalue as above.
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 Spring '11
 Zhao
 Statistics, Normal Distribution, PValues, normalCdf

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