ex11.10 {Devore6} | R Documentation

## data from exercise 11.10

### Description

Strength of concrete according to batch and test method

### Usage

    data(ex11.10)

### Format

A data frame with 30 observations on the following 3 variables.

strength
  a numeric vector of compressive strength (MPa)
Method
  a factor with levels `A` `B` `C`
Batch
  a factor with levels `1` `2` `3` `4` `5` `6` `7` `8` `9` `10`

### Source

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

### Examples

    data(ex11.10)
    xtabs(strength ~ Batch + Method, data = ex11.10)

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