Basketball coach asks half his players to stretch before each game; the other players do not stretch. after a month of games, she analyzes their playing stats. she concludes the stretching improve their performance on the court. how can the coach test the means to be sure the results not likely to happen by chance? .

The best way would be to now test the other group while the group that first stretched doesn't stretch in the coming period of time. She would have to change the people who stretch so as to see the new results for those new people.

It could be 1, 2, or 4, depending on the context.1.) they could have had a fight, and she is too humble to say anything further. she wants robert to say something first.2.) maybe he's staring at a computer playing tetris while she's wearing a *really* tight red dress. just sayin' xd3.) is unlikely given that it's only one sentence worth of context long. 4.) it's possible their relationship is more 'mutual hatred' and they tolerate one another.it could be 1, 2, or 4, as long as you can provide sufficient explanation why. remember this as you write!