Ninth Edition CoverGraziano & Raulin
Research Methods (9th edition)

 

Z = (33 - 36) / 4.5 = -.67
Drawing the figure shows that the Z-score is below the mean.

We look up .67 in the standard normal table. Since we are below the mean, we want to find the proportion beyond that Z-score.

That proportion is .2514.

Therefore, the percentile rank is (.2514)*100 = 25% (rounded to the nearest whole number).

 

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