Ten Visitors to an Art Gallery Are Asked to Rate

question 12

Multiple Choice

Ten visitors to an art gallery are asked to rate a Van Gogh painting alongside a sculpture each by Henry Moore and Michelangelo. What test would be used to see if there is a significant difference in ratings amongst the three pieces?

• A) Mann-Whitney test
• B) Signed-rank test
• C) Friedman test
• D) Kruskal-Wallis test

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Definitions:

Alditol

A type of sugar alcohol formed by reducing the aldehyde or ketone group in aldoses or ketoses, respectively.

Silver Oxide

A chemical compound of silver and oxygen that's used in some batteries and as a mild oxidizing agent in organic synthesis.

Methyl Iodide

A chemical compound with the formula CH3I, used as a methylating agent in organic synthesis.

Keto-enol Tautomerization

Keto-enol tautomerization is a chemical equilibrium between a ketone (or aldehyde) and an enol (an alcohol directly bonded to a carbon-carbon double bond), where hydrogen atoms and double bonds are redistributed.