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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