Further- Chapter 1- Organising and Recognising Data

Thing we record information about

• CATEGORICAL
• - represents qualities or attribute

• NUMERICAL
• -represents quantities
• -discrete= "how many"
• - continuous= measured variables, eg height

The mode or modal value is the most frequently occurring value or category

• Symmetrical distribution
• -single or double peak where it trails off evenly on either side

• Skewed distribution
• - histogram trails off predominantly to one side
• - right = positive skew
• - left = negative skew

Any data that stands our from the main body of data and therefore atypically high or low

The centre of distribution is the place where half the area of the histogram is on either side

• Whether the histogram is narrow or wide
• range= largest value - smallest value