1 / 5

Stratified sampling Definition

Stratified sampling Definition. Strata: groups of members that share common characteristics S tratified sampling: the population is divided into subpopulations (strata) and random samples are taken of each stratum

katina
Download Presentation

Stratified sampling Definition

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Stratified samplingDefinition • Strata: groups of members that share common characteristics • Stratified sampling: the population is divided into subpopulations (strata) and random samples are taken of each stratum • Stratified sample: has the same proportion of members from each stratum as the population does

  2. example • A population of 600 men and 500 females is going to be sampled. The proposed sample size is 300. If the company hired to sample this population will be using a stratified sampling technique, how many of each sex will be sampled?

  3. Equation

  4. process Population: male, full time: 90 male, part time: 18 female, full time: 9 female, part time: 63 Total: 180 • You want to sample 40 staff: • This tells us that of our sample of 40, • 50% should be male, full time. • 10% should be male, part time. • 5% should be female, full time. • 35% should be female, part time. Sample size: male, full time: 20 male, part time: 4 female, full time: 2 female, part time: 14 Total: 40

  5. Using the equation • ∴ there are 20 male full time workers that need to be selected

More Related