Simulated data set for getting a better understanding of intuition that
ANOVA is based off of.

A data frame with 70 observations on the following 3 variables.

- group
a factor with levels `I`

`II`

`III`

- outcome
a numeric vector

## Examples

```
toy_anova
#> # A tibble: 140 × 2
#> group outcome
#> <chr> <dbl>
#> 1 I 3.99
#> 2 I -1.24
#> 3 I -0.485
#> 4 I -0.0617
#> 5 I -0.899
#> 6 I -0.864
#> 7 I 1.68
#> 8 I 0.381
#> 9 I 0.786
#> 10 I 3.84
#> # … with 130 more rows
```