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The hypothesis and the Data are related because the hypothesis is what you think is going to happen, and if you're right, then that becomes the data
Yes. The data must not be allowed to influence the choice of the hypothesis.
You write that the data supported your hypothesis.
Discard or change the hypothesis.
The null hypothesis is an hypothesis about some population parameter. The goal of hypothesis testing is to check the viability of the null hypothesis in the light of experimental data. Based on the data, the null hypothesis either will or will not be rejected as a viable possibility.