1 Press Ctrl-A ©G Dear 2008 – Not to be sold/Free to use Organising Data Stage 6 - Year 11 General Mathematics Preliminary

2 Organizing Data (1/2) Types of Data 2.Categorical. 1.Numerical Data Can be manipulated. Can find Mean, Median, Mode and Range. Can’t be manipulated. Can only find the Mode! E.g. 1.1m, 1.7m, 3.2m. E.g. red, green, blue Mean = = 2. Mean = red + green + blue 3

3  These are the raw results we are recording  Mark off as you read through the scores. Organizing Data (2/2) Frequency Distribution Table Score (x)TallyFrequency (f)  Count up the tally marks and put the result here.

4 Displaying Data Column Graphs Data ColourFrequency Black0 Green5 Blue7 Red10 Purple Black Yellow Green Blue RedPurple Colour f Yellow3

5 60 o 120 o 84 o 60 o Displaying Data Sector Graphs Yellow = 3 / 30 x 360 o = 36 o 36 o Data ColourFrequency Black0 Green5 Blue7 Red10 Purple5 Yellow3 Green = 5 / 30 = 60 o Blue = 7 / 30 = 84 o Red = 10 / 30 = 120 o Purple = 5 / 30 = 60 o

6 5D - Quality Control (1/1) Using Statistics to ensure the product is of the required standard. To ensure product quality you will need to ensure that the required percentage meets the requirements. Example A batch of matches have their contents tested. If more than 5% of the boxes have less than 50 matches then the batch is failed. When 400 boxes are tested, 21 had less than 50 matches. = 5.25 % Failed Solution %Failed = x 100%

7 Privacy and Ethics (2/3) Some information may be considered too private to reveal for a survey. On-Selling customer information is a common practice causing credit problems. Some information, such as bank account numbers & passwords, can cause financial loss. Other information, such as address and birthday can lead to identity theft.

8 Statistical Organisations (3/3) PublicPrivate United Nations WHO ABS

9 The End