A brochure claims that the average maximum height of a certain type of plant is 0.7 m. A gardener suspects that this estimate is not accurate locally due to soil conditions. A random sample of 39 mature plants is taken. The mean height of the plants in the sample is 0.65 m. Using a 1% level of significance, perform a hypothesis test to determine whether the population mean is different from 0.7 m. Assume that the population standard deviation is 0.2 m.

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