xmp09.10 {Devore6} | R Documentation

## data from Example 9.10

### Description

The `xmp09.10` data frame has 16 rows and 3 columns.

### Format

This data frame contains the following columns:

t1.min
  modulus of elasticity (MPa) obtained 1 minute after loading on Scotch pine lumber specimens.
t4.wks
  modulus of elasticity (MPa) obtained 4 weeks after loading on Scotch pine lumber specimens.
Difference
  a numeric vector of the differences in the modulus of elasticity (MPa)

### Details

This is an extended version of the data from Example 7.11.

### Source

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

(1996), Time-dependent bending properties of lumber, J. of Testing and Evaluation, 187-193.

### See Also

`xmp07.11`

### Examples

    data(xmp09.10)
    boxplot(xmp09.10[, c("t1.min", "t4.wks")],
         main = "Data from Example 9.10")
    attach(xmp09.10)
    ## compare to Figure 9.7, page 379
    qqnorm(Difference, main = "Differences from Example 9.10",
           ylab = "Difference in modulus of elasticity")
    qqline(Difference)
    t.test(Difference, conf = 0.99)
    t.test(t1.min, t4.wks, paired = TRUE, conf = 0.99) # same thing
    detach()

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