A brand-new voltmeter is tested against a known no-load 5 volt DC source. If the voltmeter does mot indicate a true mean DC voltage reading of 5 volts, it will be returned to the manufacturer. Suppose that the manufacturer says that the standard deviation of the meter is 0.0025 volts. The voltage across the source is measured 4 times with readings 5.0038, 4.9995, 5.0020, and 5.0030. Should the voltmeter be returned to the manufacturer? Test at a confidence level of 0%.

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