A-1 How do we describe data using three measures of central tendency, and what is the relative usefulness of the two measures of variation?
]]>A-2 What does it mean when we say two things are correlated?
]]>A-3 What is regression toward the mean?
]]>A-4 How do we know whether an observed difference can be generalized to other populations?
]]>A-5 What are cross-sectional studies and longitudinal studies, and why is it important to know which method was used?
]]>1. Which of the three measures of central tendency is most easily distorted by a few very large or very small scores?
]]>2. The standard deviation is the most useful measure of variation in a set of data because it tells us
]]>4. In a ________ correlation, the scores rise and fall together; in a(n) ________ correlation, one score falls and the other rises.
]]>7. What is regression toward the mean, and how can it influence our interpretation of events?
]]>9. When sample averages are ________ and the difference between them is ________, we can say the difference has statistical significance.
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