Let x be a random variable representing the height of mature oak trees in a forest.  A friend claims that the average height of oak trees in the forest is 100 feet tall.  To test this claim we find that a sample of 16 mature oak trees has a mean height of 106.3 feet feet with a sample standard deviation of 11.8 feet.  If you assume that the population mean is 100 feet, find the P-value corresponding to the hypothesis that the average height of a mature oak tree is different than 100 feet (i.e. two-tail test).   A. 0.05   B. 0.025   C. 0.115   D. 0.078

Q: what is the sample standard deviation?

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