I am really hoping someone here can help me out here. I am in an Intro to Statistics class and the calculator instructions are for a TI-84. I have used my handy Cassio for all other math classes and been able to figure out how to do all previous calculations. This one is throwing me, though, and the manual isn't helping a bit. Here is what I need to know how to do:
Suppose we want to find the percentage of data in a Normal model with a z-score between 1 and 2. (That is, the percentage of persons/things with data values between 1 and 2 standard deviations above the mean.)
There is no data set to go along with this problem. If anyone can help me figure out how to do this, I would be most grateful. In the mean time I will keep pushing buttons until I can figure out how it works. Thanks in advance.
Normal Distribution Question
Started by
cori
, Sep 26 2006 11:23 PM
3 replies to this topic
#2
caspro
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Casio Freak
Posted 27 September 2006 - 02:57 AM
I think what you need is the expression:
P((2-M)/S)-P((1-M)/S)
where M is the Mean and S is the standard deviation.
The P('s are one symbol. On the 9850, P( is on Optn | f6 | f3 | f6 | f1
See also:
http://members.lycos...50g/normdis.txt
P((2-M)/S)-P((1-M)/S)
where M is the Mean and S is the standard deviation.
The P('s are one symbol. On the 9850, P( is on Optn | f6 | f3 | f6 | f1
See also:
http://members.lycos...50g/normdis.txt
#3
caspro
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Casio Freak
Posted 27 September 2006 - 11:51 PM
If you have one of the GB or GC models or the 9860 or Algebra FX
then there is a simpler method than the answer I gave in the last post.
From the main menu, go to mode 2 (STAT)
press f5 for Dist
then f1 for Norm
then f2 for Ncd
you can now enter the values
For the inverse function use as above: mode 2, f5, f1, but then f3 for InvN
If you have the Algebra FX, then it is similar but the fn button menus work
a bit differently.
If you only have one of the early 9850 G models without these Dists built-in
then my previous answer applies and for the inverse there is a program called PDF+ available at:
http://www.charliewa...io/casprog.html
Scroll down to Group3 on that page.
then there is a simpler method than the answer I gave in the last post.
From the main menu, go to mode 2 (STAT)
press f5 for Dist
then f1 for Norm
then f2 for Ncd
you can now enter the values
For the inverse function use as above: mode 2, f5, f1, but then f3 for InvN
If you have the Algebra FX, then it is similar but the fn button menus work
a bit differently.
If you only have one of the early 9850 G models without these Dists built-in
then my previous answer applies and for the inverse there is a program called PDF+ available at:
http://www.charliewa...io/casprog.html
Scroll down to Group3 on that page.
#4
caspro
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- Members
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Casio Freak
Posted 11 October 2006 - 08:58 PM
If that PDF+ program seems a bit long then here is a shorter program which is adapted from:
http://homepages.tes...e/calc/side.htm
which uses the bisection method to find the inverse normal score from the area/percent/probability.
\P( is the prob function on the Prob menu.
The numbers in the last line contain 4 zeroes.
0->R
"AREA"?->A
"SD"?->S
"MEAN"?->M
M-4S->B
M+4S->C
Lbl 2
R+1->R
(B+C)/2->Y
A>\P((Y-M)/S=>Y->B
A<=\P((Y-M)/S=>Y->C
R>=30=>Goto 1
Goto 2
Lbl 1
Int (10000Y)/10000
http://homepages.tes...e/calc/side.htm
which uses the bisection method to find the inverse normal score from the area/percent/probability.
\P( is the prob function on the Prob menu.
The numbers in the last line contain 4 zeroes.
0->R
"AREA"?->A
"SD"?->S
"MEAN"?->M
M-4S->B
M+4S->C
Lbl 2
R+1->R
(B+C)/2->Y
A>\P((Y-M)/S=>Y->B
A<=\P((Y-M)/S=>Y->C
R>=30=>Goto 1
Goto 2
Lbl 1
Int (10000Y)/10000
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