It Was Discovered That a Larger Proportion of Children Who

question 144

Multiple Choice

It was discovered that a larger proportion of children who slept with nightlights later developed
Nearsightedness, compared to children who did not sleep with nightlights. The headlines read,
"Leaving a light on for you children causes nearsightedness!" Later it was pointed out that
Nearsighted people have more trouble seeing in the dark and are more likely to leave lights on at
Night for their kids. And those same nearsighted parents are likely to have nearsighted kids. This is
An example of

• A) a control group.
• B) a randomized block design.
• C) a lurking variable.
• D) a placebo.
• E) bias.

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Definitions:

IR Absorptions

Specific wavelengths of infrared light absorbed by molecules, indicative of various functional groups and molecular structures in infrared spectroscopy.

M/Z Value

Mass-to-charge ratio, a key concept in mass spectrometry used to identify molecules by their mass and charge.

M+2 Peak

Denotes a secondary peak in mass spectrometry, two units higher than the molecular ion peak, often indicative of the presence of isotopes like sulfur-32 or the incorporation of two chlorine or bromine atoms.

MS Peak

A representation of a specific mass-to-charge ratio detected in mass spectrometry, indicating the presence of a particular ion or molecule fragment.