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Question: Trees, part II. Later on, the forester in Exercise shows you a histogram of the tree diameters he used in analyzing the woods that was for sale. Do you think he was justified in using a Normal model? Explain, citing some specific concerns.
Exercise: Trees. A forester measured 27 of the trees in a large woods that is up for sale. He found a mean diameter of 10.4 inches and a standard deviation of 4.7 inches. Suppose that these trees provide an accurate description of the whole forest and that a Normal model applies.
a) Draw the Normal model for tree diameters.
b) What size would you expect the central 95% of all trees to be?
c) About what percent of the trees should be less than an inch in diameter?
d) About what percent of the trees should be between 5.7 and 10.4 inches in diameter?
e) About what percent of the trees should be over 15 inches in diameter?
a manufacturer of disk drives for notebook computers wants a mtbf of at least 50000 hours. recent test results for 15
Interpret the sign of each of the regression coef?cients given in the table. For EI/predicted BMR, data values ranged between 1.4 and 2.8 with a low value associated with underreporting of energy intake.
Assume that the salaries of male and female professors are both normally distributed with equal standard deviations.
Joe is being audited by the IRS and must provide an estimate for his investment earnings over the next four years. After a thorough search, Joe can only find the following records.
A real estate agent wants to compare the variation in the selling price of homes on the oceanfront with those 3 blocks away A sample of 21 oceanfront homes sold within the last year revealed the standard deviation of the selling prices was 45,600.
1. How did American politics move from regionalism (focus on a region, like South or North) to nationalism (American issues concern the nation, not just the region) in the period between 1865 and 1896?
a random sample of 6 music majors playing song s counted the number of mistakes each made. then these musicians played
When the effect of a level for one factor depends on which level of the other factor is present, use: Select one:
an investigator wishes to determine if there are any differences in the level of blood pressure as a function of
It is reported that 21% of American households use a cell phone exclusively for their telephone service. In a sample of eight households, find the probability that:
A firm is expected to pay a dividend of $2.95 next year. Financial analysts believe the stock will be at their price target of $115 in two
In the world of finance, the buying of stocks and shares can be a risky business. The risk associated with share trading is given by a share's volatility which measures the scale of fluctuations in the price of a share over a past period of time -..
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