Correlation and Regression AnalysisDetermine the direction of relationship between the following pairs of variables. Is itpositive, negative, or zero?1. Speed and mileage of a car2. Extent of fatigue and performance in a speed test3. Income and educational attainment of employees4. Sense of humor and shoes size of persons5. Ages of husbands and wivesGiven the value of 5, describe the relationship in terms of strength and direction.1. R= 0.862. R= 0.353. R= 0.654. R= -0.565. R= 0.72The following data show the typing speed and the reading speed of ninesecretaries.Typing Speed(words per minute)Reading Speed(words per minute)Y603705655152528633487064558454445037961862500a.Construct a scatter plot for this data.b. Compute the correlation coefficient r.С.Test the significance of r at a = 0.05.%3D

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Determine the direction of relationship between the following pairs of variables. Is it positive, negative, or zero? 1. Speed and mileage of a car 2. Extent of fatigue and performance in a speed test 3. Income and educational attainment of employees 4. Sense of humor and shoes size of persons 5. Ages of husbands and wives

Determine the direction of relationship between the following pairs of variables. Is it positive, negative, or zero? 1. Speed and mileage of a car 2. Extent of fatigue and performance in a speed test 3. Income and educational attainment of employees 4. Sense of humor and shoes size of persons 5. Ages of husbands and wives

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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Concept explainers

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.

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Question

Correlation and Regression Analysis
Determine the direction of relationship between the following pairs of variables. Is it
positive, negative, or zero?
1. Speed and mileage of a car
2. Extent of fatigue and performance in a speed test
3. Income and educational attainment of employees
4. Sense of humor and shoes size of persons
5. Ages of husbands and wives
Given the value of 5, describe the relationship in terms of strength and direction.
1. R= 0.86
2. R= 0.35
3. R= 0.65
4. R= -0.56
5. R= 0.72
The following data show the typing speed and the reading speed of nine
secretaries.
Typing Speed
(words per minute)
Reading Speed
(words per minute)
Y
60
370
56
551
52
528
63
348
70
645
58
454
44
503
79
618
62
500
a.
Construct a scatter plot for this data.
b. Compute the correlation coefficient r.
С.
Test the significance of r at a = 0.05.
%3D

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