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A manufacturer believes that the mean energy output of their solar panels is 228 Watts. A...

A manufacturer believes that the mean energy output of their solar panels is 228 Watts. A random sample of 25 solar panels was tested and the average energy output was 226.5 Watts. It is known that the standard deviation of energy output for the panels the manufacturer produces is 3.5 Watts. A test is carried out to determine if the average energy output of the manufactured panels is different from 228 Watts. What is the p-value for this test (four decimal places)?

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