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3. Deskriptive Research: Data collection method & sample
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- 16-Step procedure for drawing a sample1. Define the target population.
2. Identify the sampling frame.
3. Select a sampling procedure.
4. Determine the sample size.
5. Select the sample elements.
6. Collect the data from the designated elements. - 2Population• A population is the group of units about which to make judgments.
• Important and not trivial decision at the very beginning of the research process
- e. g. B2B vs. B2C, user vs. buyer.
• Can be defined very broadly or very narrowly
- e. g. people living in Germany vs. students of economics - 3Sample• Subset of selected cases from the population
• Since a census is very expensive, sampling procedures are often used.
sample must be representative
-> The characteristics of the sample closely match those of the population.
-> It is possible to draw conclusions from the sample to the population. - 4Sample frame• List of elements from which the sample is drawn
- e. g. a telephone book.
• Sample frame should mirror the target population as much as possible. - 5Sampling procedures- Probability sampling
- Non-probability sampling - 6Sampling procedures Probability sampling- Simple random sampling
- Stratified sampling
- Cluster sampling
=> Each population element has a known, non-zero chance of being included in the sample -> representative (statistical methods can be applied) - 7Sampling procedures Non-probability sampling- Judgmental sampling
- Quota sampling
- Other types of convenience sampling
=> Involves personal judgement of the researcher (no way of insuring representative samples) - 8Probability sampling Simple random sampling (SRS)
- 9Probability sampling Stratified sampling
- 10Probability sampling Cluster sampling
- 11Non- Probability sampling Judgmental sampling
- 12Non- Probability sampling Quota Sampling
- 13Non- Probability sampling Other types of convenience sampling
- 14Central Limit TheoremIf your sample size is large enough (n>30), you can assume a normal distribution for the sample mean and you can draw conclusions from the sample over the population
- 15confidence Intervall with sigmacheck Paper
- 16confidence interval with scheck paper
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- MaRe Karteikarten am 3. Deskriptive Research: Data collection method & sample , erstellt von Martin Reichmuth am 27/10/2018.
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