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Question: Determining the age of trees is of interest to both individual land owners and to the Forest Service of the US Department of Agriculture. The simplest (though not the most reliable) way of determining the age of a tree is to use the relationship between a tree's diameter at breast height (4-5 ft) and age. Read the data on the average age of three types of trees at different diameter values into the data frame ad by ad = read.table("TreeDiamAAge3Stk.txt", header = T). Then, use the commands attach(ad); plot(diam, age, pch = 21, bg = c("red", "green", "blue")[unclass(tree)]); legend( x = 35, y = 250, pch = c(21, 21, 21), col = c("red", "green", "blue"), legend = c("SMaple", "ShHickory", "WOak")) to plot the data and add a legend. Comment on any difference in the growth patterns of the three different trees.
The mill has the ability to run the same grade on multiple paper machines. Compare the relationship between the two instruments for the following (consider both average and variability):
Welding processes have been automated over the past decades. Weld quality features, such as final metallurgy and joint mechanics, typically are not measurable online for control. Therefore, some indirect way of controlling the weld quality is nece..
What is the probability of selecting 10 production employee at random on a hot summer day and finding that none of them are absent.
Why don't researchers who want to test hypotheses about the relationships between variables worry a great deal about random sampling?
according to the texas department of state health services there are approximately 17.7 million adults age 18 living in
The following table gives the probability distribution of a discrete random variable x.
The population in Park City is made up of children, working-age adults, and retirees. Table shows the three age groups, the number of people in the town.
All three wines are produced in the optimal solution. How little would the profit for Blanc have to be for it to no longer be produced?
What is the current make up of the EEOC and what is the process in which complaints are brought to the board? Do you agree with this process? Why or Why not?
the frequencies of different blood types of 200 people who volunteered at a plasma center is given in the table.blood
How would you expect the mean for these data to differ from what you found in the previous exercise?- Check your answer to part (a) using the One-Variable Statistical Calculator applet.
a random sample of n 57 observations produced a mean x 30.8 and a standard deviation s2.3a find a 90 confidence
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