Data Session 9, Part B: Selecting the Sample

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:

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

Next > Part C: Investigating Variation in Estimates

Session 9: Index | Notes | Solutions | Video