Showing posts with label statistics. Show all posts
Showing posts with label statistics. Show all posts

## Wednesday, January 5, 2011

### Visitors Poll

Who are you?!! I'm interested. The first person that says West Australians are actually Australian obviously doesn't live here :-)

Russ.

## Thursday, December 16, 2010

### Site statistics

7800 page hits and 5500 unique visitors this year from around the world: Turkey to Bolivia, Canada to Indonesia, UK and Spain; hello to you all.

The most popular topics searched were the CAS calculator pages, Hattie's meta analysis, as well as local topics national curriculum and NAPLAN.

## Thursday, March 4, 2010

### Site Stats

10,000 page loads and 6000 visitors since 2008. Yay!

## Sunday, January 10, 2010

### Combinations & Permutations on the CAS Classpad330

The factorial(!) button is found in the soft keyboard under the abc tab (hit the up arrow next to 'z' and the '1' turns into a '!' (like with a computer keyboard). It's probably worth looking for (or making) an eActivity to speed it up a little.

Going through the first two 3C exercises in Saddler, the easiest way I've found to use the calculator is to open the softkeyboard, press cat tab, scroll to N (using the alphabet at the base of the softkeyboard), highlight nCr, press INPUT and seperate the n & r values with a comma from the hard keyboard.

(Update 1/2/2009): One of my students found another way via softkeyboard->mth tab-> calc->nCr which is a lot simpler and nPr is also there!

When you need to use multiple functions just rehit the INPUT button with nCr still highlighted. Completed the whole of 3C Ex 1A & B with a combination of no calculator and this function.

viola!

I don't have my calculator books here, so this will have to do until I get back to school.

Here's a link to an index of other CAS calculator posts.

## Sunday, August 23, 2009

### Moving averages and the CAS calculator

On the fx casio, moving averages were a bit of a doddle.. stick in the values and use the MAV application.

The suggested method for the classpad 330 according to the classpad website is to use spreadsheet mode. This has some disadvantages that I have not been able to overcome with my brief investigation.

To set up a MAV problem, clear the sheet and enter the basic data in columns. To calculate the MAV click on the middle cell of the first series (eg in a 3pt MAV it would be the second cell) and use the Action column to find the mean of the first three data cells. Then copy your mean cell down the column by highlighting the rest of the column using the stylus and then use the edit menu -> paste.

To graph it is a little on the fiddly side. Highlight the data column and the MAV column and press the line graph icon (there are two, it's the first one). Select the graph and go View->Markers to turn off the data markers. Under the Type menu, make sure you have selected Column Series.

This should display the graph.

If you need a line of regression, select the MAV line with the stylus and select an appropriate regression function on the toolbar. The main issue with it is that there is no way to interpolate or extrapolate data (the main thing you wish to do with this sort of data) for predicting data points whilst in spreadsheet mode for the line of regression. It's been fairly frustrating. I can recreate the line of regression for the MAV in "graph and tab" mode and use this but it would be easier just to have a trace mode on the stats graph... oh well...

Here's a link to an index of other CAS calculator posts.

Update 15/09/09: Download v3.04 of the classpad operating system from here. It greatly enhances the ability of spreadsheet mode to perform regression in spreadsheet mode. You will need to register and login before downloading it.  It's quite a neat trick to click on the line of regression, copy it and then paste the formula onto the spreadsheet at the the bottom of the y column.  Modify the formula such that x becomes a cell reference (eg A2) and viola - an alternate to trace for predicting y values.

:-)

## Saturday, May 30, 2009

### Milestones

6000 hits since July last year.. 750 hits & 499 unique visitors for May.. passed the 200 post mark... not bad if I do say so myself..

Hello to everyone out there !!

## Wednesday, October 22, 2008

### Casio Classpad 330, Creating a Histogram

Today in class we looked at how to produce a Histogram using the list editor. A Histogram is used when data is continuous (there is no gap between intervals).

Class interval (Frequency)
0 <= x <>=80 (1)

Tap in the list editor. Tap Edit in the menu bar. Tap Clear All. and tap Ok in the dialog box. If a graph is open tap the StatGraph pane to select it. Tap the cross in the top corner of the window to remove the graph.

Name a column in the list editorclassmid’using the soft keyboard. Put the midpoint of each class into the classmid column. eg. {5,15, 25, .., 85} (make sure you name the column before putting the data in!).

Name a column in the list editor ‘freq’ using the soft keyboard. Add each corresponding frequency into the freq column. eg. {3,10,16,..,1}.

Tap SetGraph in the menu bar. Tap Setting. Select Histogram in the Type dropdown, select classmid in the XList dropdown and freq in the Freq dropdown. Make sure the Draw option is on. Tap Set at the base of the dialog box.

Tap the StatGraph icon in the icon bar to display the graph. Make HStart 5 (midpoint of first interval) and HStep 10(size of intervals).

A Histogram will appear. Tap the StatGraph pane and then tap Analysis in the menu bar. Tap Trace in the menu.

A flashing crosshair should appear above the first column of the graph. Use the blue cursor key to navigate column values in the graph. You can use these values to create your histogram on graph paper. The xc at the base of the graph are horizontal axis values and the Fc are your vertical axis values.

viola!

Other educationWA articles on CAS calculators