People Who Are Not Contacted or Who Refuse to Cooperate

question 62

Multiple Choice

People who are not contacted or who refuse to cooperate are called:

• A)random errors
• B)biased respondents
• C)sample selection errors
• D)nonrespondents

---

Definitions:

Signals

In spectroscopy, the representations of energy interactions with samples, providing information about molecular structure.

Quartet

In NMR spectroscopy, a signal split into four peaks of specific intensity ratio, indicating the influence of three equivalent nuclei on the observed nucleus.

Spin-Spin Splitting

A phenomenon in nuclear magnetic resonance (NMR) spectroscopy where nuclear spin states interact, leading to multiple peaks for a single nucleus.

Relative Area

A term that describes the proportion or percentage of a specific area with respect to a larger reference area, often used in analytical techniques.