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Understanding Statistics in Intelligence Testing

Group 1

Statistics are often used to describe and interpret the results of intelligence testing.

Question 1a

Short answer
Describe three measures of central tendency (mean, median, and mode).

Question 1b

Short answer
Describe a skewed distribution.

Question 1c

Short answer
Relate the three measures of central tendency to a normal distribution.

Question 1d

Short answer
Relate the three measures of central tendency to a positively skewed distribution.

Question 1e

Short answer
An intelligence test for which the scores are normally distributed has a mean of 100 and a standard deviation of 15. Use this information to describe how the scores are distributed.

Question 1f

Short answer
In two normal distributions, the means are 100 for group I and 115 for group II. Can an individual in group I have a higher score than the mean score for group II? Explain.

Group 2

Apply knowledge of psychological research in answering the following questions about intelligence scores.

Question 2a

Short answer
Explain why norms for standardized intelligence tests are periodically updated.

Question 2b

Short answer
Describe how to determine whether an intelligence test is biased.

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