homework help

Chapter 10: Re-expressing Data Goals of Re-expression: Goal 1: Make the distribution of a variable more symmetric. Goal 2: Make the spread of several groups more alike. Goal 3: Make the form of a scatterplot more nearly linear. Goal 4: Make the scatter in a scatterplot spread out evenly rather than following a fan shape. Straightening Relationships: Re-expression can be done many ways. See Ladder of Powers at the end of the notes. The Ladder of Powers orders the effects that the re-expressions have on data. (If you try taking the square roots of all the values in a variable and it helps, but not enough, then moving farther down the ladder to the logarithm or reciprocal root will have a similar effect on your data, but even stronger.)