Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

Session 9, Part B:
Selecting the Sample

In This Part: Fair Sampling | A Fair Sampling Method | Variation in Estimates

A computer can perform random sampling and estimation much more quickly than you can by hand. Here are three more random samples of 10 sub-regions generated by a computer.

Sample 1

Sample 2

Sample 3

 Sub-region 1 6 3 5 Sub-region 2 7 3 4 Sub-region 3 6 5 4 Sub-region 4 5 6 5 Sub-region 5 8 7 2 Sub-region 6 7 3 4 Sub-region 7 7 4 3 Sub-region 8 8 7 7 Sub-region 9 5 2 4 Sub-region 10 8 4 5 Sample Total 67 44 43 Sample Average 67 / 10 = 6.7 44 / 10 = 4.4 43 / 10 = 4.3 Total Estimate 6.7 x 100 = 670 4.4 x 100 = 440 4.3 x 100 = 430

Problem B5

Record your estimates in the following table:

Sample

Estimate

 First Sample 450 Problem B3 Activity Sample 1 Activity Sample 2 Activity Sample 3

Based on these five estimates, how many penguins do you think there are in the entire region?

 Session 9: Index | Notes | Solutions | Video