ASM 275 / ASM275 LAB 2 - ACCURACY, PRECISION, AND ERROR
O °'
Look at the placement of the darts with respect to the green bullseye (the true value).
... [Show More] Are the darts accurate and precise’ [4]
E*plananaw
TheanmverisC boMhacourateamd precise.
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O °'
Look at the placement of the darts with respect to the bultseye (the true value]. Are the darts accurate and precise* [4]
The answer is A because even though the darts are all settered with respect to the bulfseye they do surround the target. So they are not precise but on average they do approximate the measurement.
O °'
Look at the placement of the darts with respect to the bullseye {the true value). Are the darts accurate and precise* [4]
A the darts are accurate but not precise
The answer is B, precise but not accurate.
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O °'
Look at the placement of the darts with respect to the bultseye {the true value). Are the darts accurate and precise* [4]
' ' A the darts are accurate but not precise
I' s{•iann•ion
The answer is D, neither precise nor accurate.
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Fière is a dartbaard shek ng the bulles fthe ta rget or true value) and the Iccatioro where the ciarts \•ære throvm fyelloîv dote). The bottom in-lage shows a non-nal distributiori where thie horizontal axis represents thie rrieasurerrierrt value on the dartboard and the vertical arJs représente ho•z common those values are. The vertiœ I li ne la beled "Refererœ value" is directly beneath the buIlseye. This is our TRUE value th+at ue are irying to aczorately ar+d precisely +îæasure. TÏne horizontal line A Is the differenœ between the TRUE value ar+d thie MEASURED value and li ne B represents ho•z spread out the darts are. In This diag+am, Ifnes A and B repræent \•Aat? [5]
Reference value
Value
TI-ie a ns+ver is A The diflérence beb+even the true a nd rriaasureci value is accoray. In this eample accuracy Is poor.
§6
Based on the a bove, which diagram represents a more precise measurement set? [5]
Reference value
Value
A
Reference value
B Value
B B
The answer is A, precision i Efers to how clustered the diffei ent measurement attempts are. Nore clustered = less spread out.
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O •
There are many ways to reduce inter-observer and intra-observer error. One way is to have the same observer take measurements at the same time of day with the same caliper What does this accomplish?
Explanation
The answer is B.
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O •
What if two observers used the same measurement instrument to measure diPerent specimens. This would have what aPect?
Explanation
The answer is A. Using the same measurement tool would reduœ inter-observer error.
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In the next unit we spend œnsiderable time discussing sexual dimorphism, the fact that men tend to be larger than women. Does this apply to the human skull as well? This is a basic hypothesis: Males have significantly larger skulls than females. [8]
To test this, you measure a sampie of male skulls and a sample of female skulls and compare the mean values to see which is larger. However, the male skulls included in your sample are from unusually small individuals. Your study suffers from which type of error? Consider the definitions above before answering
Exptanaôon
The answer is B. The sample selected is not appropriate and that decision will bias the results, this is systematic error that is impossible to correct for.
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During the same research project you later find out that the calipers you used to measure the females skulls were not calibrated correctly. Your study suPers from: [8]
Hint
Incorrect. The measurement tool was defective for only part of the sample. Furthermore, you only used these calipers for females, this is systematic error and you have to redo the study. A lot of money has been wasted. The answer is B.
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