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Inferential Statistics. For example, in contract pricing, we can use stratified sampling of a proposed bill of materials to infer the degree it is overpriced or under-priced. Populations and Samples. The terms population and sample are used throughout any discussion of statistics.
1:37 4:11 Suggested clip Generalizing k scores in n attempts | Probability and Statistics | Khan YouTubeStart of suggested client of suggested clip Generalizing k scores in n attempts | Probability and Statistics | Khan
Stratified sampling involves grouping population into subgroups called strata, where random sampling us used in each stratum to obtain sample. Analyzing 20% of the items that are under $25,000 is a way of effectively using stratified sampling.
Stratified sampling offers several advantages over simple random sampling. A stratified sample can provide greater precision than a simple random sample of the same size. Because it provides greater precision, a stratified sample often requires a smaller sample, which saves money.
Advantages of Sampling saves time to a great extent by reducing the volume of data. You do not go through each of the individual items. Sampling Avoids monotony in works. You do not have to repeat the query again and again to all the individual data.
For this reason, stratified random sampling is a preferable method over quota sampling, as the random selection in stratified random sampling ensures a more accurate representation of the larger population. However, researchers use quota sampling when stratified random sampling is not possible.
Stratified sampling offers some advantages and disadvantages compared to simple random sampling. Because it uses specific characteristics, it can provide a more accurate representation of the population based on what's used to divide it into different subsets.
Some of the most common strata used in stratified random sampling include age, gender, religion, race, educational attainment, socioeconomic status, and nationality.
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