Sample Size # of black beads # of red beads % black beads % red beads 1 1 0 3 2
ID: 3305303 • Letter: S
Question
Sample Size
# of black beads
# of red beads
% black beads
% red beads
1
1
0
3
2
1
5
4
1
10
5
5
20
15
5
30
17
13
how many units would you want to sample to get the right answer?
on one of the answers above, which would it be?
If half of your grade was from accuracy and half was from lowest number of units sampled, which of the above schemes would you choose to be graded on?
Which sampling scheme do you think the defendant in this case would want you to use?
Assuming that you arrived at the correct answer for the % of black and red beads, devise a scheme for calculating the number of each bead in the population without counting them all. Explain how you would do it, but don’t actually do it.
Sample Size
# of black beads
# of red beads
% black beads
% red beads
1
1
0
3
2
1
5
4
1
10
5
5
20
15
5
30
17
13
Explanation / Answer
Sample Size
# of black beads
# of red beads
% black beads
% red beads
1
1
0
1/ 1 = 100%
0/25 = 0%
3
2
1
1/44 =2.27 %
1/25 =4%
5
4
1
4/44 = 9 %
1/25 =4%
10
5
5
5/44 = 11.36%
5/25 =20%
20
15
5
15/44 = 34.09 %
5/25 =20%
30
17
13
17/44 =38.63%
13/20 =52%
Total
44
25
100%
100%
Sample Size
# of black beads
# of red beads
% black beads
% red beads
1
1
0
1/ 1 = 100%
0/25 = 0%
3
2
1
1/44 =2.27 %
1/25 =4%
5
4
1
4/44 = 9 %
1/25 =4%
10
5
5
5/44 = 11.36%
5/25 =20%
20
15
5
15/44 = 34.09 %
5/25 =20%
30
17
13
17/44 =38.63%
13/20 =52%
Total
44
25
100%
100%
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