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A lumber company is making boards that are 2727.0 millimeters tall. If the boards are too...

A lumber company is making boards that are 2727.0 millimeters tall. If the boards are too long they must be trimmed, and if they are too short they cannot be used. A sample of 21 boards is made, and it is found that they have a mean of 2725.9 millimeters with a standard deviation of 9.0. Is there evidence at the 0.05 level that the boards are either too long or too short? Assume the population distribution is approximately normal.

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TOPIC:t-test for the population mean.

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