I a Coefficient of Correlation Close to 0 (Say, 0

question 146

Multiple Choice

i. A coefficient of correlation close to 0 (say, 0.08) shows that the relationship between two variables is quite weak. ii. If the coefficient of correlation is 0.68, the coefficient of determination is 0.4624.
iii. The standard error of estimate measures the accuracy of our prediction.

• A) (i), (ii), and (iii) are all correct statements.
• B) (i) and (ii) are correct statements but not (iii).
• C) (i) and (iii) are correct statements but not (ii).
• D) (ii) and (iii) are correct statements but not (i).
• E) (i), (ii), and (iii) are all false statements.

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Definitions:

Proton Spin Decoupled

A method used in nuclear magnetic resonance (NMR) spectroscopy where the interactions between proton spins are removed to simplify the spectrum.

3-Hexanone

A ketone with the formula C6H12O, characterized by a carbonyl group located on the third carbon atom of a six-carbon chain, used in fragrances and as a solvent.

Proton Spin Decoupled

A nuclear magnetic resonance (NMR) technique where the interaction between proton spins is removed or reduced, enhancing spectral resolution.

0-50 Ppm

A concentration range indicating 0 to 50 parts per million, often used to describe the presence of a substance within another substance.