What are three disadvantages of census data? - Time consuming and expensive, cannot be used when testing destroying processes, hard to process large quantities of data., What is the definition of simple random sampling? - A simple random sample of size n is one where every sample of size n has an equal chance of being selected., What are three advantages of random sampling? - Free of bias, easy and cheap for small samples and populations, each sampling unit has a known and equal chance of selection., What are two disadvantages of simple random sampling? - Not suitable for large samples and populations, sampling frame needed., What is systematic sampling? - The required elements are chosen at regular intervals from an ordered list., What are two advantages of systematic sampling? - Simple and quick to use, suitable for large samples and large populations., What are two disadvantages of systematic sampling? - A sampling frame is needed, bias introduced if sampling frame is not random., What is stratified sampling? - The population is divided into mutually exclusive strata and a random sample is taken from each., What are two advantages of stratified sampling? - Sample accurately reflects population structure, proportional representation of group within population., What are two disadvantages of stratified sampling? - Population must be clearly classified into distinct strata, some disadvantages as same disadvantages as simple random sampling within each stratum., What is quota sampling? - Quota sampling is a non-random sampling method where an interviewer or researcher selects a sample that reflects the characteristics of the whole population., What are four advantages of quota sampling? - Allows a small population to still be representative of the population, no sampling frame required, quick, easy and inexpensive, easy comparison between different groups within a population.,

Maths sampling

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