Illustration 15.11. Twenty-five pairs of values of variate x and y led tothe following results.N= 25, Ex = 127, Ey = 100, Ex = 760, Ey² = 449 and Exy = 500.A subsequent scrutiny showed that two pairs of values were copieddown as x|y whereas the correct values where x8 148 128.6.6.8.obtain the correct value of coefficient.

Answered: Image /qna-images/answer/391412c3-64e5-4dc0-9179-33a8fa12adc9.jpg

Answered: Illustration 15.11. Twenty-five pairs…

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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4. During a given exercise in class data on the heights of fathers (X) and of sons (Y) was collected. The following results were then obtained: Σχ= 71, ΣΥ = 70, Σ χ2555, Σγ?526 and ΣΧΥ-527 %3D Check for the level of association between the heights of fathers 10 and of 10 sons
A score S is used to predict whether a disease is present. If the score is greater than a threshold value, the corresponding person is classified as ill, otherwise as healthy. Here, the scores S; for 9 persons are given. Furthermore, it is known whether the persons are actually ill (Y, = 1) or not (Yi = 0). The data look as follows: S; | Y; 0.3 0 1.2 1 0.7 0.8 1 0.1 0.4 1 1.1 0 0.2 0 1.4 1 (a) Draw by hand the ROC curve for the given data. Explain your procedure and the calcu- lation methods. (b) Calculate the area under the curve (AUC) by hand. Does this value indicate a good or bad classification? (c) Calculate the partial area under the curve (PAUC) if the specificity is to be at least 0.65. How do you judge this value?
2.1/7
None
28 No Y Xi For the data in the table, YI = 83.8-5.2Xi; Whether the model has been estimated, answer the 1 54 5 2 47 8 following relevant questions accordingly: var (B2) =? 3 41 9. 4. 35 9. 28 11 6. 17 12 4,72 0,66 O 1,12 O 3,54 O 2,18 О
3.7.1 only
Q1. A psychologist conducted a study on the relationship between introversion and shyness. The values are results for scales of introversion and shyness. High positive scores on each scale indicate high introversion or shyness; and high negative scores indicate low introversion or shyness. Data collected from 10 people as follows: Introversion 4 -7 -1 0 6 7 -4 -9 -5 8 Shyness 11 -7 -1 -3 0 7 -1 -8 -1 5 a) Compute the correlation coefficient relating introversion and shyness scores. b) Find the regression equation which predicts introversion from shyness. c) What introversion score would you predict from a shyness score of 7?
П. 2. What is the degrees of freedom in a multiple regression model( with n values in each variable) with 14 independent variables when doing a t-test for the individual regression coefficients determined?
Help 1. Is there a significant difference between Group X and Group Y? How do you know?

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