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Accuracy of Estimates:
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Direct Estimates and Actual Weights of Eight Sagebrush Plants |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
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Estimate (g) |
20 |
45 |
150 |
300 |
30 |
45 |
90 |
10 |
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Actual (g) |
15 |
50 |
165 |
285 |
28 |
70 |
110 |
25 |
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Difference |
5 |
5 |
15 |
15 |
2 |
25 |
20 |
15 |
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% of Error |
33.3% |
10.0% |
9.1% |
5.3% |
7.1% |
35.7% |
18.2% |
60.0% |
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Average Difference (g) = |
12.8 |
My estimates were, on average, 12.8 grams higher or lower than actual |
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Standard Error = |
2.8 |
My estimate was 12.8 ±
2.8 (std. err.) from the actual weights |
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Average % of Error = |
22.3% |
On average, my estimates were 22 % higher or lower than actual |
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Adjusted Estimates:
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1 |
2 |
3 |
4 |
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Estimate (g) |
24 |
350 |
63 |
82 |
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Adjusted Estimate |
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341 |
72 |
89 |
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y = 0.938(24) + 12.58 =
35 |
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