Standard Scores and Percentiles

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• Understanding psychological test scores and terminology

  These include: Standard Scores, Percentiles, Age/Grade Equivalents, Confidence Intervals, Bands of Error, and the Bell Curve. Understanding Test Scores Most psychological tests are reported using standard scores and percentiles.

• Z-score, Normal Probability & Percentiles

  Using a mean of 7.55 and a standard deviation of 1.86, convert the following values of X into z-scores: A. X = 10.48, z = B. X = 3.17, z = C. X = 8.41, z = D. X = 5.62, z = 3.

• Common Questions and Answers about Psych Test Properties

  Understanding Test Scores Most psychological tests are reported using standard scores and percentiles. Standard scores describe how an individual performed on that test, compared to people the same age in the norm group.

• Finding standard scores and percentiles

  Tony The expert examines finding standard scores and percentiles.

• Scores within one and two standard deviations

  403600 Normal distribution: Standard deviation percentiles Using a standard normal distribution, what percent of scores fall within one standard deviation of the mean? What percent of scores fall two or more standard deviations below the mean?

• Normal Distribution

  Corresponding z-scores percentiles are determined.

• Normal Probability & Percentiles: Five cognitive classes

  In other words, it is more informative to give the difference in z-scores for two IQ scores than it is to give the difference in percentiles. To demonstrate this point, calculate the difference in z-scores for IQs at the 50th and 55th percentiles.

• Finding percentiles of known normal distributions

  22180 Finding percentiles of known normal distributions All standard IQ test scores are normally distributed and are set up so that the mean score is 100. However, the standard deviation differs from test to test.

• What statistical measures are used for describing dispersion?

  Quartile and percentiles are other measures. Variance is the average squared difference of scores from the mean score of a distribution. Standard deviation is the square root of the variance.

• Descriptive Statistics and Its Use in Education

  standard scores, scaled scores, t-scores and percentiles