Question about Microsoft Office Standard for PC

# Normal distribution curve

How do I chart two normal distribution curves in the one graph

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## 1 Answer

### Benjamin Patri

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If you right click on the graph and click on edit data or source data, you should be able to graph another set of data, depending on if you have office or vista, it may be under something different but will be very similar

Posted on Mar 18, 2008

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Ray is a bit off track, there are indeed a few mathematicians around Fixya.

Here you are dealing with the standard error of a proportion. The proportion of students of interest in the sample is 540/970 = 0.5567. This is usually denoted by p.

Now you want the standard error of this proportion, s. It is
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Now we turn to the Normal Distribution. We want the Z-statistic which corresponds to a confidence level of 92%, or 0.92. Z is the number of Standard Deviations on the Normal Curve which takes in 92% of the area under the curve. You can look this up in any table of the Normal Distribution, or with an online calculator

http://onlinestatbook.com/2/calculators/normal.html

This gives Z = 1.751. So the true result is somewhere in p ± (1.751 * 0.0160)
or 0.5567 ± 0.0279. The margin of error is 0.0279.

Now I don't know here if your tutor wants you to use a Continuity Correction, which is sometimes applied because we are approximating the Normal Distribution here. If so this is
0.5 / N = 0.5 / 970 = 0.0005.
This small amount is added to the Margin of Error, to make 0.0284.

A good reference for you to use is

http://onlinestatbook.com/2/estimation/proportion_ci.html
http://onlinestatbook.com/2/index.html
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Press Y=
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Read the following to use the intersection function.
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Here are some screen captures         8helpful
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1. You draw two or more graphs.
2. After the graphs are displayed, press [2nd][TRACE] to access the (CALC)ulate menu.
3. Select [5:Interesct]
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7. After a short while the calculator gives you a solution.
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See the screen capture to learn how to use the trace functionality.  312 views

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