1. Foresters want to estimate the average age of trees in a stand.Determining age is cumbersome because one needs to count the treerings 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 forestersmeasure the diameter of all 1132 trees and find that the population meanequals 10.3. They then randomly select 20 trees for age measurement.Tree No.Diameter, xAge, yTree No.Diameter, xAge, y112.0125115.7612345678811.4119128.0807.9831310.31149.0851412.014710.599159.21227.9117168.51067.369177.08210.21331810.788911.7154199.3971011.3168208.299a. Plot the data.b. Estimate the population mean age of trees in the stand and give anapproximate standard error for your estimate. Why did you use themethod of estimation that you chose?c. Estimate the population total age of trees in the stand and give anapproximate standard error for your estimate.

Ratio estimate = 117.620Standard error of the estimate = 3.976Regression estimate is 118.363Standard…

Answered: 1. Foresters want to estimate the…

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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Dr. A. Ventura is interested in determining what kinds and how many pets people own in Bakersfield. He stands outside Petco and asks people what kind of pet they own. This is the result of his survey: dog=1; cat=2; bird=3; reptile=4; fish=5; other=6 1,1,2,2,2,1,1,3,2,3,1,1,1,2,2,4,4,2,2,1,1,1,5,4,3,4,1,1,1,2,2,6,1,1,2,2,1,2,1,2,6,3,4,5
Solve
I need 41, 42, 43, and 44 please.
3. The number of goals scored by Wayne Gretzky was recorded for seasons 1978 – 1999. (Please note the data set has been ordered from smallest to the largest for your convenience). 5, 9, 11, 16, 23, 23, 31, 38, 40, 40, 41, 46, 51, 52, 54, 55, 62, 71, 73, 87, 92 A. Construct a stem-and-leaf display for the data and describe the shape of the distribution (symmetric, skewed left, skewed right, bell-shaped, etc., any obvious outliers). B. What is the fraction of the data that is less than or equal to 31? C. Given that Ex, = 920 and Ex = 52 436 find the mean and standard deviation. D. Find the (i) median, (ii) Q1, (iii)Q:, (iv) the interquartile range (IQR), (v) the lower and upper fences. E. Construct a Box-plot for the data. What are your conclusions about the shape of the distribution? Compare with the results in Part A. F. Would the mean or the median be the most suitable measure to use to represent the central location of this distribution? Give reasons for your answer.
Classify each of the following as nominal, ordinal, interval, or ratio data and explain. a. the time required to produce each car on an assembly line. b. the number of litres of water a family drinks in a month. c. the ranking of four student projects in your class after they have been designated as excellent, good, satisfactory, and poor. d. the telephone area code of clients in India. e. Explain the four groups of data in detail.
A reseacher desires to know if the age of a child is related to the number of cavities he or she has.
An effect size of .55 would be considered?
The accompanying table gives the population of 6 regions in 2008 and the area of these regions. Use the table to answer the following questions. Complete parts (a) through (c) below. LOADING... Click the icon to view the data table. a. Determine and report the rankings of the population density by dividing each population by the number of square miles to get the population density (in people per square mile). Use rank 1 for the highest density and 6 for the lowest density. Region Population Area (square miles) Population Density Rank Rate A 12,459,500 49,919 nothing ▼ 3 4 6 1 5 2 B 12,982,395 59,329 nothing ▼ 4 1 6 2 5 3 C 18,345,648 45,938 nothing ▼ 2 6 1 4 3 5 D 19,433,196 49,599 nothing ▼ 1 4 6 3 2 5 E 24,385,213 267,477 nothing ▼ 3 1 2 5 4 6 F 36,784,071 150,713 nothing ▼ 5 3 6 4 1 2 (Round to two decimal places as…
A comparative Psychologist tests the amount of time it takes for mice to complete a maze as their dependent variable. What type of data would this be? a. ratio b. interval c. ordinal d. nominal

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