Which of the Following Is True About Standard Deviation

question 52

Multiple Choice

Which of the following is true about standard deviation?

• A) The first step in calculating the standard deviation is calculating the square root.
• B) The second step in calculating the standard deviation is to subtract each measurement from the intermediate value and then square that difference.
• C) The last step in calculating the standard deviation is to sum the squared values and divide by the number of values minus one.
• D) Standard deviation is a type of average where the positive and negative numbers sum to zero.
• E) The amount of difference of the measurements from the central value is called the sample standard deviation.

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Definitions:

Molecular Ion Peak

The peak in a mass spectrum that represents the molecule of the sample as a positively charged ion.

Fragment Peaks

Fragment peaks in mass spectrometry refer to the peaks that represent the masses of fragments from the molecule being ionized and broken apart, aiding in the determination of molecular structure.

M/Z Fragment

Refers to the mass-to-charge ratio of ions observed in mass spectrometry, crucial for identifying and characterizing molecules based on their fragmentation patterns.

Molecular Ion Region

The part of a mass spectrum that shows the peaks corresponding to the molecular ions, providing information about the molecular weight of a compound.