dora like to explore. recently she explored southeast australia where she found

Question

dora like to explore. recently she explored southeast australia where she found some very large trees known as eucalyptus regnans o rmountain ash. she wondered if they were taller. on average than the coastal douglas firs of her native state of oregon in the United states, which have an average height of 250 feet in old growth areas. Dora measured the heights of 15 mountain ash trees in southeast australia and found an average height of these trees of 293 feet. suppose s= 25 feet. assume the heights of the 15 trees in doras sample are representative of the heights of the heights of all mountain ash trees in southeast australia. the t statistic for this problem is 6.661. how many degrees of freedom does this t statistic have? a)14 b)15 c)24 d)13 e) the statistic does not have degrees of freedom.

Explanation / Answer

number of observations=15

degrees of freedom =(n-1) =14

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