Off on another tangent...

The unwritten bonus question on the next quiz (Friday for Math IV; Monday for Acc III) is "When is Mr. Lewis's birthday?"  You will need to write next to the answer where you saw this question...

More Rational Function Graphing Practice

Here's a nice website to practice graphing.  If you do it, practice # 1, 7, 9, 11, 15, 23, 25, & 27.

http://hotmath.com/help/gt/genericalg2/section_7_1.html

You will see that you can check your answers.





























Bring these answers, and work, on your own paper by Friday, 11/8/2013, to receive some bonus points, but don't tell anyone....  This applies to all Mr. Lewis's classes (now and in the immediate future...).

Excel Sheet

When I opened the Google Doc of the Excel page at home, it had this "=_xlfn.NORM.INV(RAND(),65,5)" in cell A1. When I deleted the "_xlfn." and the "." in between NORM and INV, it worked fine.

This is what A1 should have in it: =NORMINV(RAND(),65,5)
B1 should look like this: =A1-1.96*5/SQRT(30)
C1 should look like B1 except with a plus.

Of course, this is for a normal distribution, or for a means question. Remember, if you have a proportion, then the function was BININV or BINOMINV, I think.

Again, email or Tweet your questions.

Random Normal Distribution Example

Here is a Google Drive link to the example Excel sheet I showed in 1st block this morning.

To generate the random numbers I used NORMINV(RAND ( ), 65, 5).  I made up a mean of 65 and a standard deviation of 5.  Then I dragged down 100 cells.

To build the confidence intervals, I went to cell B1, typed in an equals sign, clicked on cell A1, then did a minus, 1.96 * my standard deviation, and then divided by SQRT (n).  

If you hold the cursor over any of the cells in Row 1 you will see what I typed in.

Email or Tweet me if you have questions.  Math IV projects are due Monday.

Accelerated Math 3 Practice Test Unit 1

Here are the answers to the review I gave 2nd & 4th Thursday and 1st on Friday, as best as I can type them in:

1) E
2) C
3) D
4) A
5) 0.4
6) 0.0126
7) 18.6
8) 1
9) 2.28 %
10) A
11) (7.02,8.98)
12) (146.71,153.29)
13) (65.7982,66.6018)
14) A
15) 99 %
16) 38 416
17) (199.9835,200.01645)
18) (61.9088,68.0912)
19) (100.4,108.24)
20) C

Random Number Generator for Normal Distribution

This is a site Ms. Erwin and I found for finding random numbers using a normal distribution, in case your calculator does not do randNorm.  It will take a little working with, but it is nice.

Enter in your mean, your standard deviation, and choose 100 trials.  Make sure to click Y for displaying results in a table.

When I get home I will look at random.org, which I think has to have some kind of normal distribution generator.

http://www.wessa.net/rwasp_rngnorm.wasp

Amended:

random.org does have a normal distribution random number generator, which worked nice.  The problem I had with it was that it produced the answers in scientific notation, which is easy to get around.

I finally read the internet and figured out how to use Excel to serve this purpose, and it was beautiful.  I will provide a link to an example I did in 1st block in another post.

The command is NORMINV(RAND( ), mean, standard deviation).  It works beautifully and saves lots of time.

Math Team Schedule

MATH TEAM:

Friday, 10/18: Math Madness Week # 1 Match during Titan Time, Math Lab

Tuesday, 10/22: Georgia Math League Contest # 1, 7:30 AM, Room 2209

Tuesday, 10/29: Math Team Meetings, 7:30/3:35, Room 2209

Also, look for us on Club Day!