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@ludofl3x
intercessory prayer is the only kind that seems answerable, certainly the only kind that would be measurable (I asked for X, X did or didn't happen).
This presumes that "didn't happen" isn't an answer. You are measuring for demand-fulfillment which is not the only operative method of intercessory prayer. Also, if prayer is dependent on (for example) the merits of the asker or sincerity of the prayer, to avoid questions of an atheist subverting the process, then the lack of positive response might be a reflection on the flaw in the prayers, not the ineffectiveness of a comparatively sincerely process.
Otherwise, separated from any religious context, what you are testing is a random person yelling at the sky "gimme a hundred bucks, now! Small bills. Non-sequential." And if Mr. Moneybag doesn't materialize then "prayer" is deemed "not working." But that demand isn't prayer.
Once you call it "prayer" it can't be just "request" even if the nature of the prayer includes request. It still has to qualify as prayer, judged within the religious context which generates that definition.