In Order to Estimate the Difference Between the Average Hourly

question 36

Multiple Choice

In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the following data have been gathered. $\begin{array}{lll}& \text { Downtown Store } & \text { North Mall Store } \\ \text { Sample size } & 25 & 20 \\\text { Sample mean }& \$ 9 & \$ 8 \\\text { Sample standard deviation } & \$ 2 & \$ 1\end{array}$ A 95% interval estimate for the difference between the two population means is

• A) .071 to 1.929.
• B) .226 to 1.774.
• C) 1.09 to 4.078.
• D) 1.078 to 2.922.

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Definitions:

Primary Mental Abilities

a theory suggesting that intelligence is made up of several primary abilities, such as reasoning, verbal comprehension, numerical skills, and spatial visualization, that are distinct from each other.

L.L. Thurstone

A pioneering psychologist known for his contributions to psychometrics and the theory of multiple intelligences.

Deviation IQ Scores

A method of measuring intelligence where an individual's score is expressed as a deviation from the mean score of a standardization sample.

Raw Scores

The initial, unmodified scores obtained from assessments or tests before being transformed through scaling, norming, or statistical adjustments.