This data is simulated and is meant to represent students scores from three
different lectures who were all given the same exam.

A data frame with 164 observations on the following 2 variables.

- m1
Represents a first midterm score.

- lecture
Three classes: `a`

, `b`

, and `c`

.

## References

OpenIntro Statistics, Chapter 8.

## Examples

```
anova(lm(m1 ~ lecture, classdata))
#> Analysis of Variance Table
#>
#> Response: m1
#> Df Sum Sq Mean Sq F value Pr(>F)
#> lecture 2 1290.1 645.06 3.4839 0.03302 *
#> Residuals 161 29810.1 185.16
#> ---
#> Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
```