State the conclusion based on the results of the test. The mean of the pressure required to open a certain valve is known to be u = 7.8 psi. Due to changes in the manufacturing process, the quality-control manager feels that the average pressure has changed. The null hypothesis was rejected. Choose the correct answer below. O A. There is not sufficient evidence that the mean of the pressure required to open a certain valve has changed. O B. The mean of the pressure has not changed. O c. The mean of the pressure has changed. O D. There is sufficient evidence that the mean of the pressure required to open a certain valve has changed. O E. There is sufficient evidence that the mean of the pressure required to open a certain valve has not changed. OF. There is not sufficient evidence that the mean of the pressure required to open a certain valve has not changed.

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