STATISTICS


Here is our Stats Pre-test

Census at Schools:
Go to the website: census at schools
Then select "Take part in the census" in BLUE
Then select "Students take part" in ORANGE
You will first need to enter the "Registration code" 41536 and then answer the questions

We will then investigate 'Scatter plots' using census at schools, 'random samples' heights and arm spans. We use 'I wonder questions' like: I wonder if there is a relationship between girls armspans and their height? We also make a prediction before drawing the graph, eg: I predict that girls armspans and heights will be very similar.

SCATTER PLOT/GRAPH
In census at schools, select 'Get a random sample' (in orange), select 'I agree' and then:
sub population (select gender and only have female ticked), to the Right select Year (tick only 9)
total sample size, add in, 35
then enter and you will receive an excel spreadsheet.

1. Go through the list you have and 'clean' it. That means if you have any results missing (ie: any armspan or height results missing) or absolutely impossible results you were not use that date/cross it out.
2. Now prepare a graph, on the bottom is height and up the side is armspan. The scales must be consistent, eg: going up in 5's or 10's etc. If you are not starting from zero use a 'lightning bolt'.
3. Plot the data (you need at least 30).
4. Make sure you label your axes and give your graph a title.

TYPES OF DATA

There are two types of data:

Discrete Data (including: quantitative (number data, eg: how many pets do you own) and qualitative (eg: how do you get to school?)
Discrete Data is graphed on a bar graph; grouped discrete data is graphed on a histogram.

Continuous Data is data that can be measured (eg: heights, weight, time, distance, age etc.)
Continuous Data is graphed on a histogram

Here are some very useful powerpoint on describing 'shapes' of graphs:

You will also need to know about back to back stem and leaf graphs:








You can create your own graphs from this link


Welcome to our computer session on tables and graphs

external image bargraph.jpg
We are going to make our own bar graphs today :)
Using this website (cut and paste the link in a browser):
http://illuminations.nctm.org/ActivityDetail.aspx?ID=204

This website also creates graphs and is fun!! Click Here