The diameter of the Douglas r tree is measured at a height of 1.37 meters.The following data
Question:
The diameter of the Douglas ï¬r tree is measured at a height of 1.37 meters.The following data represent the diameter in centimeters of a random sample of 12 Douglas ï¬rs in the western Washington Cascades.
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(a) Obtain a point estimate for the mean and standard deviation diameter of a Douglas ï¬r tree in the western Washington Cascades.
(b) Because the sample size is small,we must verify that the data come from a population that is normally distributed and that the data do not contain any outliers. The ï¬gures show the normal probability plot and boxplot. Are the conditions for constructing a conï¬dence interval for the population mean diameter satisï¬ed?
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(c) Construct a 95% conï¬dence interval for the mean diameter of a Douglas ï¬r tree in the western Washington Cascades.
Step by Step Answer:
a Using technology we obtain 1473 cm and 288 s cm b Yes All the data valu...View the full answer
