What Z-Score Value Separates the Highest 10% of the Scores

question 41

Multiple Choice

What z-score value separates the highest 10% of the scores in a normal distribution from the lowest 90%?

• A)z = 1.28
• B)z = 0.25
• C)z = -1.28
• D)z = -0.25

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Definitions:

Population Mean

The average of a set of numerical values obtained from every member of a population.

Robust Estimator

A statistical method or measure that is not unduly affected by outliers or deviations from assumptions in the underlying data distribution.

Nonnormality

The deviation from the normal distribution in a set of data, where the data does not follow a bell-curve shape.

Mound-Shaped

A description of a symmetrical, bell-shaped distribution often associated with the normal distribution.