Exhibit 7-6: a Group of Researchers Hypothesizes That Listening to Music

question 106

Multiple Choice

Exhibit 7-6: A group of researchers hypothesizes that listening to music while studying for an exam influences test scores.They randomly selected 28 subjects and divided them into four groups.All groups studied silently for a test for an hour a day for a week.Group 1 studied without music.Group 2 studied with classical music in the background, Group 3 with country, and Group 4 with jazz.The following are the final test scores:
$\begin{array}{l}\begin{array}{lll}\text { Group 1 } & \text { Group 2 } \\50 & 59 \\45 & 57 \\42 & 57 \\41 & 55 \\40 & 56 \\39 & 53 \\38 & 51\end{array}\begin{array}{lll}\text { Group 3} & \text { Group 4 } \\60 & 49 \\56 & 45 \\56 & 45 \\55 & 42 \\54 & 41 \\51 & 39 \\50 & 37\end{array}\end{array}$

-Refer to Exhibit 7-6.What is the null hypothesis?

• A) \(\mu\)_{Group 1} \(\geq\) (\(\mu\)_{Group 2} + \(\mu\)_{Group 3} + \(\mu\)_{Group 4}) /3
• B) \(\mu\)_{Group 1} \(\leq\)(\(\mu\)_{Group 2} + \(\mu\)_{Group 3} + \(\mu\)_{Group 4}) /3
• C) \(\mu\)_Group1 =\(\mu\)_{Group 2} = \(\mu\)_{Group 3} = \(\mu\)_{Group 4}
• D) None of these are true.

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Definitions:

Molecule

The smallest physical unit of an element or compound, consisting of one or more atoms held together by chemical forces.

Ion

A molecule or atom that has acquired an overall electric charge from either losing or gaining electrons.

Hydrogen Bond

Hydrogen atoms bound covalently to either N or O atoms have a small positive charge that is weakly attracted to the small negative charge of other atoms, such as O or N; it can occur within a molecule or between different molecules.

Intermolecular

Pertaining to forces or interactions that occur between molecules.