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Flashcards Statistics I&II (Theory Only!) Year 1.2/2.4 Psychology
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What is stratified random sampling and when is it (dis)proportional?
What is stratified random sampling and when is it (dis)proportional?
Stratified random sampling is a type of probability sampling that divides the population into separate groups, called strata, and then selects a simple random sample from each stratum. Stratified random sampling is proportional if the sampled strata proportions are the same as those in the entire population. Stratified random sampling is disproportional if the sampled strata proportions differ from the population proportions; this is used if the group is such a small part of the population that it may not have enough representation in a simple random sample to allow for precise inferences.
What is the interquartile range (IQR)?
What is the interquartile range (IQR)?
The difference between the lower and upper quartiles. The interquartile range describes the spread of the middle half of the observations. The IQR increases as the variability increases. In contrast to the ordinary range or the standard deviation, the IQR is not sensitive to outliers.
What is the central limit theorem?
What is the central limit theorem?
The central limit theorem states that with a large sample size, the sampling distribution of the sample mean is approximately a normal distribution.
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