Chapter 1 - Data Collection

Learning Objectives - What to get out of this chapter

Understand ‘population’, ’sample’ and ‘census’, and comment on their advantages + disadvantages   Understand advantages + disadvantages of ‘Simple random sampling’, ‘Systematic sampling’, ‘Stratified sampling’, ‘Quota sampling’ and ‘Opportunity sampling’   Define qualitative, Quantitative, discrete and continuous data + understand grouped data   Understand large data set + how to collect data from it + identify types of data and calculate simple statistics

1.1 - Population and Samples

Population and Samples A Population = A whole set of items that are of interest   A Census = measures every member of a population   A Sample = measures only a big selected group from a population 

1.2 - Sampling