What is the mean score and standard deviation of the WISC IV?
Performance on the WISC is measured by a standard score, or Full-Scale IQ (FSIQ), with a range of 40–160, a mean score of 100 (average), and a standard deviation of 15.
What is the standard deviation of the WISC?
15 points
4. Standard deviation (SD): The standard deviation is the average distance (or number of points) between all test scores and the average score. For example, the WISC has an SD of 15 points. Most kids fall between the range of 85–115 points.
What is 2 standard deviations below the mean of the WISC-V?
For example, a score that is 2 standard deviations below the mean would have a percentile rank of 2 (0.13 + 2.14 = 2.27). In other words, just over 2% of the area underneath the normal curve is to the left of a standard score that is 2 standard deviations below the mean.
What do WISC IV scores mean?
High Average: 110-119. Students who test in this range are high average and do not generally struggle in school. Above Average: 120-129. Students who test in this range are above average and do not generally struggle in school. Moderately Gifted: 130-145.
What does the comprehension subtest on the WISC IV measure?
The subtest was developed to measure non-verbal reasoning and the ability to understand abstract visual information. The individual is presented with a picture of a pair of scales in which there are missing weights, and they have to choose the correct weights to keep the scales in balance.
What does the arithmetic subtest on the WAIS IV measure?
The Arithmetic subtest assesses working memory by having participants complete mental arithmetic problems. The LNS subtest is an alternative working memory measure and is not typically included in the calculation of the WMI.
What is the standard deviation for the WAIS IV?
15
The WAIS-IV was standardized on a sample of 2,200 people in the United States ranging in age from 16 to 90. An extension of the standardization has been conducted with 688 Canadians in the same age range. The median Full Scale IQ is centered at 100, with a standard deviation of 15.
What does similarities subtest measure on WISC?
Similarities measures logical thinking, verbal concept formation and verbal abstract reasoning. Two similar but different objects or concepts are presented, and the student is asked to tell how they are alike or different. Similarities is an untimed core Verbal Comprehension sub-test.
What is 1 1 2 standard deviations below the mean?
The standard deviation is 22. So 1 and a half standard deviations is 1.5*22 =33. So 110-33 = 77 is the score that is 1.5 standard deviations from the mean.
What is considered 1.5 standard deviations below the mean?
So a z-score of 2 is like saying 2 standard deviations above and below the the mean. A z-score of 1.5 is 1.5 standard deviations above and below the mean. A z-score of 0 is no standard deviations above or below the mean (it’s equal to the mean).