Lucille is interested in the effects of alcohol consumption

Lucille is interested in the effects of alcohol consumption on style of play while playing the videogame Sims. She asks a group of 15 college students to play Sims under one of the following conditions: no alcohol, 1 ounce of alcohol, 2 ounces of alcohol, or 3 ounces of alcohol. Lucille measures on a scale of 1 to 10 how prosocial the students\' style of play is. After collecting the data, Lucille performs an ANOVA and finds that she can reject the null hypothesis. On this basis, what does Lucille know?

Solution

Null hypothesis of ANOVA says that mean of groups all the are same. And alternative hypothesis says that at least one mean is differ.

So \"She knows that there is a difference among the groups somewhere, but she does not know where.\" is correct.