1 / 10

Stratified Sampling

Stratified Sampling. Objective: To be able to use stratified sampling methods to find a suitable sample size Grade A. Easy Stratified Sampling. The table shows the number of pupils in each year. I want to take a stratified sample of 10% people. How many pupils will I need from each Year?.

beverlyjevans
Télécharger la présentation

Stratified Sampling

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 Sampling Objective: To be able to use stratified sampling methods to find a suitable sample size Grade A

  2. Easy Stratified Sampling The table shows the number of pupils in each year I want to take a stratified sample of 10% people. How many pupils will I need from each Year? Year 7: 10% x 320 = 32 Year 8: 10% x 311 = 31.1 31 Year 9: 10% x 380 = 38 Year 10: 10% x 289 = 28.9 29 Year 11: 10% x 300 = 30

  3. Stratified Sampling The table shows the number of pupils in each year I want to take a stratified sample of 250 people. How many pupils will I need from each year? Add up the totals 320 + 311 + 380 + 289 + 300 = 1600

  4. Stratified Sampling The table shows the number of pupils in each year I want to take a stratified sample of 250 people. How many pupils will I need from each year? So, we need a sample of 250 out of a possible 1600 This is our sample size: 250 1600

  5. Stratified Sampling The table shows the number of pupils in each year 320 I want to take a stratified sample of 250 people. How many pupils will I need from each year? Year 7: Year 8: Year 9: Year 10: Year 11: Sample Size: 250 × = 50 1600

  6. 48.4375 Stratified Sampling The table shows the number of pupils in each year 311 I want to take a stratified sample of 250 people. How many pupils will I need from each year? Year 7: 50 Year 8: Year 9: Year 10: Year 11: Sample Size: 250 × = 49 48.59375 1600

  7. 48.4375 Stratified Sampling The table shows the number of pupils in each year 380 I want to take a stratified sample of 250 people. How many pupils will I need from each year? Year 7: 50 Year 8: 49 Year 9: Year 10: Year 11: Sample Size: 250 × = 59 59.375 1600

  8. 48.4375 Stratified Sampling The table shows the number of pupils in each year 289 I want to take a stratified sample of 250 people. How many pupils will I need from each year? Year 7: 50 Year 8: 49 Year 9: 59 Year 10: Year 11: Sample Size: 250 × = 45 45.15625 1600

  9. 48.4375 Stratified Sampling The table shows the number of pupils in each year 300 I want to take a stratified sample of 250 people. How many pupils will I need from each year? Year 7: 50 Year 8: 49 Year 9: 59 Year 10: 45 Year 11: Sample Size: 250 × = 46.875 47 1600

  10. 48.4375 Stratified Sampling The table shows the number of pupils in each year I want to take a stratified sample of 250 people. How many pupils will I need from each year? We needed a stratified sample of 250 people Year 7: 50 Year 8: 49 Year 9: 59 Year 10: 45 Year 11: 47 Check: 50 + 49 + 59 + 45 + 47 = 250

More Related