If a Particular Batch of Data Is Approximately Normally Distributed

question 12

Multiple Choice

If a particular batch of data is approximately normally distributed, we would find that approximately

• A) 2 of every 3 observations would fall between _± 1 standard deviation around the mean.
• B) 4 of every 5 observations would fall between _± 1.28 standard deviations around the mean.
• C) 19 of every 20 observations would fall between _± 2 standard deviations around the mean.
• D) All of the above.

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Definitions:

Observed Score

The actual score or value obtained from measuring or testing an individual's performance or trait.

Error Impact

Refers to the effect that inaccuracies in data or calculations can have on the results of a study or analysis.

Reliability Equation

A formula used to calculate the consistency or stability of scores obtained from tests measuring the same construct.

Reliability

Reliability refers to the consistency of a measure or instrument; a reliable instrument yields similar results under the same conditions over multiple trials.