To find proof as to whether he is "in love" or not, Yukimura pats Himuro on the head from point-blank range. Seeing this, Ibarada, an upperclassman in the Ikeda Lab, talks about the need for a control experiment. In other words, in order to prove that the racing of his heart is because of Himuro specifically and not just because he's facing a woman, Yukimura has to pat Kanade and Ibarada on the head too. Himuro, on the other hand, sets out to prove that food made with love tastes better and cooks, but...
there's no way to tell if the given factors are 
affecting the results, so it's pretty pointless.
من المستحيل معرفة إن كانت العوامل المطروحة
 .هي التي تؤثّر بالنتيجة لذا لا فائدة ترجى منها
lässt sich nicht ableiten, ob die Resultate
von diesen Variablen abhängen. Es ist nichtssagend.
puisque vous ne pouvez pas
déterminer
non c'è modo di stabilire se i fattori dati
stiano influenzando i risultati, quindi è piuttosto inutile.
não há como saber se os fatores estão
afetando o resultado, então é inútil.
не позволяет определить, что именно 
конкретные факторы влияют на результат.