Foresters want to estimate the average age of trees in a stand. Determining age is cumbersome, because one needs to count the tree rings on a core taken from the tree. In general, though, the older the tree, the larger the diameter, and diameter is easy to measure. The foresters measure the diameter of all 1132 trees and find that the population mean equals 10.3. They then randomly select 20 trees for age measurement. (Use R to estimate the population mean age of trees in the stand using regression estimation and give an approximate standard error for your estimate.) ง C Tree No. Diameter, x Age, y Tree No. Diameter, x Age, y 1 12.0 125 11 5.7 61 2 11.4 119 12 8.0 80 3 7.9 83 13 10.3 114 4 9.0 85 14 12.0 147 10 567890 10.5 99 15 9.2 122 7.9 117 16 8.5 106 7.3 69 17 7.0 10.2 133 18 10.7 11.7 154 19 9.3 11.3 168 20 8.2 2828 97 99 Tree No. Diameter, x Age, y Tree No. Diameter, x Age, y 1 12.0 125 11 5.7 61 10 234567890 11.4 119 12 8.0 80 7.9 83 13 10.3 114 9.0 85 14 12.0 147 10.5 99 15 9.2 122 7.9 117 16 8.5 106 7.3 69 17 7.0 82 10.2 133 18 10.7 88 11.7 154 19 9.3 11.3 168 20 8.2 45 97 99
Foresters want to estimate the average age of trees in a stand. Determining age is cumbersome, because one needs to count the tree rings on a core taken from the tree. In general, though, the older the tree, the larger the diameter, and diameter is easy to measure. The foresters measure the diameter of all 1132 trees and find that the population mean equals 10.3. They then randomly select 20 trees for age measurement. (Use R to estimate the population mean age of trees in the stand using regression estimation and give an approximate standard error for your estimate.) ง C Tree No. Diameter, x Age, y Tree No. Diameter, x Age, y 1 12.0 125 11 5.7 61 2 11.4 119 12 8.0 80 3 7.9 83 13 10.3 114 4 9.0 85 14 12.0 147 10 567890 10.5 99 15 9.2 122 7.9 117 16 8.5 106 7.3 69 17 7.0 10.2 133 18 10.7 11.7 154 19 9.3 11.3 168 20 8.2 2828 97 99 Tree No. Diameter, x Age, y Tree No. Diameter, x Age, y 1 12.0 125 11 5.7 61 10 234567890 11.4 119 12 8.0 80 7.9 83 13 10.3 114 9.0 85 14 12.0 147 10.5 99 15 9.2 122 7.9 117 16 8.5 106 7.3 69 17 7.0 82 10.2 133 18 10.7 88 11.7 154 19 9.3 11.3 168 20 8.2 45 97 99
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Foresters want to estimate the average age of trees in a stand. Determining age is cumbersome, because one needs to
count the tree rings on a core taken from the tree. In general, though, the older the tree, the larger the diameter, and
diameter is easy to measure. The foresters measure the diameter of all 1132 trees and find that the population mean
equals 10.3. They then randomly select 20 trees for age measurement. (Use R to estimate the population mean age of
trees in the stand using regression estimation and give an approximate standard error for your estimate.)
ง
C
Tree No.
Diameter, x
Age, y
Tree No.
Diameter, x
Age, y
1
12.0
125
11
5.7
61
2
11.4
119
12
8.0
80
3
7.9
83
13
10.3
114
4
9.0
85
14
12.0
147
10
567890
10.5
99
15
9.2
122
7.9
117
16
8.5
106
7.3
69
17
7.0
10.2
133
18
10.7
11.7
154
19
9.3
11.3
168
20
8.2
2828
97
99
Transcribed Image Text:Tree No.
Diameter, x
Age, y
Tree No.
Diameter, x
Age, y
1
12.0
125
11
5.7
61
10
234567890
11.4
119
12
8.0
80
7.9
83
13
10.3
114
9.0
85
14
12.0
147
10.5
99
15
9.2
122
7.9
117
16
8.5
106
7.3
69
17
7.0
82
10.2
133
18
10.7
88
11.7
154
19
9.3
11.3
168
20
8.2
45
97
99
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