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

Answers

Answer 1

Answer:

hello your question has some missing information attached below is the missing information

answer : mean ratio of estimate = 117.62

              standard error ( SE ) = 3.9765

Step-by-step explanation:

Given data : n = 20,  μx = 10.3  , N = 1132

∑ age ( yi) = ( 125 + 119 + --------- + 99 ) =  2148

∑ ( Y - rX)^2 = 6116.728

mean of age ( y ) = ∑ y / 20 =  2148 / 20 = 107.4

mean of diameter ( x ) = ∑x /20 = 188.1 / 20 = 9.405

∴ ratio estimate  = y /x = 107.4 / 9.41 = 11.4195

i) The mean of ratio estimate

= 11.4195 * μx  = 11.4195 * 10.3 = 117.6204

ii) determine the standard error ( SE )

calculate ; [tex]s^{2} _{r}[/tex] = 1 / ( n-1 ) *  ∑ (Y - rX)^2  = 1/19 ( 6116.728 ) = 321.933

Var (  μr ) = [ ( N - n ) / N*n ]*[tex]s^{2} _{r}[/tex]  =  [ ( 1132 - 20 ) / (1132*20) ] * 321.933

               = 15.81226

therefore the SE = √15.81226 ≈ 3.9765

Foresters Want To Estimate The Average Age Of Trees In A Stand. Determining Age Is Cumbersome, Because

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Answer:

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Step-by-step explanation:

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Answer:

7.0686

your welcome :D.

                                                                                                                                           


Please Help!!!

You shared a bag of fruit snacks with 4 friends. You and each of your friends got 35 or fewer fruit snacks. Solve the inequality below to find the number of fruit snacks that could be in the bag.

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Answer: option 4 x < 175

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x < 175

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Step-by-step explanation:

4×=175

isgsusjisghsusgsbsihhdvejisfehsiwjgsusj

Eric is studying two number patterns. Pattern A starts at 0 and has the rule "add 6." Pattern B starts at 0 and has the rule "add 3." What is the relationship between corresponding terms in the two patterns?

The terms in Pattern B are 3 times the corresponding terms in Pattern A.
The terms in Pattern B are 2 times the corresponding terms in Pattern A.
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Answers

Answer:

D) The terms in Pattern B are one half the corresponding terms in Pattern A.

Step-by-step explanation:

Pattern A | Pattern B

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12 divided by 1/2 = 6

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The owner of a company determines the median and mean salaries for his 20 employees. The median salary is $41,000, and the mean is $52,000. Which BEST explains why the mean is so much greater than the median?

Answers

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A.
1/4 2/3 3/10

B.
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C.
2/5 5/8 3/4

D.
3/8 9/10 7/12


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Answer:

i think its a 1/4 then 2/3 and 3/10

I’m sure it is 1/4 2/3 3/10 I don’t know the second though. Have a great day good luck

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Answer:

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Step-by-step explanation:

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Answer:

a = 104

Step-by-step explanation:

a = 104 because it is an inscribed angle with an arc of 208 degrees

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Answer:

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hope this answer helps you!

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Answer:

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Step-by-step explanation:

Answer: =5/12

Step-by-step explanation: Hope this help :D

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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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Answer:

Step-by-step explanation:

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Answers

Missing information :

The model was omitted from the question ; the possible model relating to the question was browsed online and could possibly be :

N(t) = 1.07t^2.3 for 0 ≤ t ≤ 10 months

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Step-by-step explanation:

Given the model to determine the number of rats that have developed cancer after initial exposure ; N(t) = 1.07t^2.3

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Exclamation : Hope this helps

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The manager of a company runs an online job ad. She gets 1,000 responses. However, 3 4 of the responses are from applicants who are not qualified. The manager will not interview these candidates. She decides to interview 1 5 of the remaining applicants. How many applicants will she interview?
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The fractions are given as:

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Read more about number lines at:

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Answers

Answer:

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Step-by-step explanation:

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11 Function

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Answers

Answer:

The shorter base is 3

Step-by-step explanation:

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Answers

Answer:

150 inches

Step-by-step explanation:

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Mrs. Lopez need to sew a piece of cloth whose length be 150.72 inches.

What is circumference?

A circumference gives the length around a circular object, it is the perimeter used for the circular objects.

Given that a circular tablecloth has a radius of 24 inches, we need to find the length around it,

So, the length around a circular object is its circumference,

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= 3.14 × 48
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Hence Mrs. Lopez need to sew a piece of cloth whose length be 150.72 inches.

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https://brainly.com/question/28757341

#SPJ2

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