As part of a study of the physiology of wheat maturation, an agronomist selected six wheat plants at random from a field plot. For each plant, she measured the moisture content in two batches of seeds: one batch from the "central" portion of the wheat head, and one batch from the "top" portion, with the results shown in the following table.30 Construct a 90% confidence interval for the mean difference in moisture content of the two regions of the wheat head.

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Percentage moisture PlantCentral 62.7 63.6 60.9 63.0 62.7 63.7 Top 59.7 61.6 58.2 60.5 60.6 60.8 3