**Study Guide **

**Correlation**

**“For a skewed distribution, the mean is pulled in the direction of the extreme scores.” Is this statement true or false**

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**Which average is defined as the value that has 50% of the cases below it?**

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**If two groups are equal on average, will they necessarily be equal in their variability?**

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**What is the outlier in this set of scores: 2, 18, 18, 20, 20, 21, 22?**

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**Is the interquartile range or the range a better measure of variability?**

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**What is the interquartile range of these scores: 10, 10, 11, 12, 13, 13, 14, 14, 14, 15, 17, 18, 18?**

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**The interquartile range is associated with which average?**

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**What symbol do statisticians use for the standard deviation?**

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**What is the symbol for the deviation of a score from its mean?**

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**If the mean for a group equals 40.00 and the standard deviation equals 5.00, what percentage of the cases in a normal distribution lies between 40 and 45?**

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**If the mean for a group equal 27.00 and the standard deviation equals 3.00, what percentage of the cases in a normal distribution lies between 24 and 30?**