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Uncertainty in Measurement: Significant Figures03:34

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All the digits in a measurement, including the uncertain last digit, are called significant figures or significant digits. Note that zero may be a measured value; for example, if a scale that shows weight to the nearest pound reads “140,” then the 1 (hundreds), 4 (tens), and 0 (ones) are all significant (measured) values.
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In any measurement, the precision of the measuring tool is an essential factor. An ordinary ruler, for example, can measure length to the closest millimeter; a caliper, on the other hand, can measure length to the nearest 0.01 mm. As a result, the caliper is a more precise measurement tool because it can measure extremely minute changes in length. The measurements will be more accurate if the measuring tool is more precise.
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David Wechsler, a psychologist who worked with World War I veterans, developed a significant IQ test in 1939 called the Wechsler-Bellevue Intelligence Scale. This test was innovative because it combined several subtests that measured both verbal and nonverbal skills, reflecting Wechsler's belief that intelligence is a global capacity involving purposeful action, rational thinking, and effective interaction with the environment. This test later evolved into the Wechsler Adult Intelligence...
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Uncertainty in measurements can be avoided by reporting the results of a calculation with the correct number of significant figures. This can be determined by the following rules for rounding numbers:
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Using Electroencephalography Measurements and High-quality Video Recording for Analyzing Visual Perception of Media Content
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The Leuven Embedded Figures Test (L-EFT): measuring perception, intelligence or executive function?

Hanne Huygelier1, Ruth Van der Hallen1,2, Johan Wagemans1

  • 1Laboratory for Experimental Psychology, KU Leuven, Leuven, Belgium.

Peerj
|April 3, 2018
PubMed
Summary
This summary is machine-generated.

The new L-EFT task does not strongly correlate with perceptual style, intelligence, or executive functions. Its construct validity is questionable, suggesting face validity may not reflect empirical findings.

Keywords:
EFTEmbedded figuresExecutive functionsIntelligencePerceptual styleWeak central coherence

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Area of Science:

  • Cognitive Psychology
  • Psychometrics

Background:

  • The Embedded Figures Test (EFT) is used to assess perceptual style, intelligence, and executive functions.
  • Previous interpretations of EFT performance lack clarity regarding its construct validity.

Purpose of the Study:

  • To investigate the construct validity of a new Embedded Figures Test (L-EFT).
  • To determine the correlation between L-EFT performance and measures of intelligence, executive functions, and perceptual styles.
  • To compare L-EFT performance with the original group EFT.

Main Methods:

  • Administered the L-EFT and correlated scores with established measures of intelligence, executive functions, and perceptual styles.
  • Compared L-EFT performance directly against the group EFT.

Main Results:

  • L-EFT performance showed weak correlations with estimates of local/global perceptual style, intelligence, and executive functions.
  • L-EFT performance demonstrated similar associations with memory span and fluid intelligence as the group EFT.
  • Empirical findings on L-EFT construct validity did not align with its apparent face validity.

Conclusions:

  • The L-EFT does not appear to measure a general perceptual or cognitive style/ability.
  • The study highlights discrepancies between a task's face validity and its empirical construct validity.
  • Further research is needed to clarify the precise cognitive constructs measured by EFT variants.