xmp09.09 {Devore6} | R Documentation

## data from Example 9.9

### Description

The `xmp09.09` data frame has 16 rows and 4 columns.

### Format

This data frame contains the following columns:

Subject
  a numeric vector
Before
  a numeric vector
After
  a numeric vector
Difference
  a numeric vector

### Details

### Source

Devore, J. L. (2003) Probability and Statistics for Engineering and the Sciences (6th ed), Duxbury

### Examples

    data(xmp09.09)
    boxplot(xmp09.09[, c("Before", "After")],
       main = "Data from Example 9.9")
    attach(xmp09.09)
    boxplot(Difference, main = "Differences in Example 9.9")
    qqnorm(Difference,
       main = "Normal probability plot (compare Figure 9.5, p. 377)")
    t.test(Difference)
    t.test(Before, After, paired = TRUE)   # same test
    detach()

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