Data

  • Created by: aarafa11
  • Created on: 04-06-18 10:25
What is census data
Data collected from the entire population
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Whats the advantages of census data
completely accurate data
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Whats the disadvantages of census data
Time consuming. There's a larger volume of data that needs to be processed. The data collection can't be destroyed
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What is sampling data
Observation taken from the subset of a population
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Whats the advantages of sampling data
Cheaper. Quicker. Less data to be processed
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Whats the disadvantages of sampling data
May not be accurate. Data may not be large enough to represent group
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What is random simple sampling data
Sample has an equal chance of being selected
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Whats the advantages of random simple sampling data
Bias free. Easy and cheap to do. Sample has an equal chance of being selected
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Whats the disadvantages of random simple sampling data
Not suitable for large population. Needs a sample frame
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What is a sample frame
List of all the items in your population
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Whats the procedure for simple random sampling
Identify the sample frame using numbers for each item. Use a random number generator
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What is systematic sampling
They are chosen in random intervals in an ordered list
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Procedure to systematic sampling
Take every k value : pop size/ sample size (Must be random)
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Whats the advantage of systematic sampling
Simple. Quick. Can use large sample/population
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Whats the disadvantage of systematic sampling
Sample frame needed. Can be bias if not random
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What is stratified sampling
Population in strata, Do random sampling
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How to work out stratified sampling
proportions = sample size/ pop size
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What are the advantages of stratified sampling
Reflects the population structure. There's proportional representation with groups
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What are the disadvantages of stratified sampling
Population must be classified into strata. Population size cannot be large . Sample fame needed
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What is a strata
Population divided into groups
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What is a quota sampling
Selects the sample which reflects the characteristic of the whole population
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Whats the procedure of quota sampling
Population divided into groups according to characteristic. Interviewer selects the units
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Whats the advantages of quota sampling
Small sample to represent the population. No sample frame needed. Quick. Easy comparison between groups
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Whats the disadvantages of quota sampling
It can introduce bias. Population divided into groups. Inaccurate. No responses isn't recorded
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Whats the disadvantages of NON- RANDOM SAMPLING
It can introduce bias
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What are the random sampling
Simple random, systematic, stratified
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What are the non random sampling
quota, (opportunity/ convenience )
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What is opportunity/ convenience sampling
Sample from people available at the time. study is carried out. Must fit the criteria
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Whats the advantage opportunity/ convenience sampling
easy to carry out. Inexpensive
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Whats the disadvantage opportunity/ convenience sampling
Unlikely to provide representative samples. Highly dependent on individual research
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What would be the sample frame for the 20 computer circuit board having its own serial number
The circuit board having its own serial number
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What would be the sampling units for the 20 computer circuit board having its own serial number
A circuit board
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Card 2

Front

Whats the advantages of census data

Back

completely accurate data

Card 3

Front

Whats the disadvantages of census data

Back

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Card 4

Front

What is sampling data

Back

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Card 5

Front

Whats the advantages of sampling data

Back

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