I have answered that multiple times...I already responded to that. Hence the line of questioning we're currently on now.
Sorry but I fail to see how this addresses the point at hand. Cancer treatments are testable via the scientific method. Their efficacy is demonstrated in the results they produce. That's why we can roughly calculate survival rates for various cancers and various treatments. If they worked only at the rate of chance, they'd be deemed ineffective.
But none of this address the problem with God's refusal to answer the prayers of amputees and parents of starving and/or sick children all across the globe. If you are saying prayer works at the rate of chance, then you are essentially saying they're useless.
What is obvious is that no matter what one answers it will never be enough for you. Some people call it bias, others call it unbelief, and still others would qualify it as flat-earth thinking.
But you are free to live without prayer. I choose to reap the benefits of prayer.