ANOVA.

A consumer magazine wants to compare the lifetimes of ballpoint pens of three different types.

$\backslash$table$[[$Brand $1,$Brand $2,$Brand $3],[260,181,238],[218,240,257],[184,162,241],[219,218,213]]$

Does the data indicate that there is a difference in the mean lifetime of the three brands.

$\backslash$table$[[$Hypothesis$,$Ho:$],[,$Ha:$],[$Decision$,],[$Conclusion$,],[,]]$