Statistics

sampling and bias

Sampling And Bias

Representative Sample DataThe total group you want to find out about is called the population...but you might not to be able to get data for every person or thi...
collecting data

Collecting Data

Data can come in two forms: Qualitative (words) Quantitative (numbers) Quantitative data can be: Discrete i.e. can only take certain values  - e.g....
mean, median, mode and range

Mean, Median, Mode and Range

Mode = The Most CommonThis is easy to find in tallied data and is not distorted by extreme values. However sometimes it doesn't exist or there is more than one ...
stem and leaf diagram

Averages and Spread

The range tells you how spread out all the data values are. The interquartile range tells you the spread of the middle 50% of values.QuartilesQuartiles divide t...