Answered: Draw the distribution of points in 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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;AUTO . Complete the following table and calculate the correlation coefficient, regression equation, and coefficient of determination, R Sunlight hours, x Section IV- Regression & Correlation y ху Yield (flowers), y 0.3 11 0.6 18 0.9 29 1.2 33 1.5 43 Σ Σ a. Correlation coefficient, r- b. Write down the regression equation: c. Use the regression equation to predict the flower yield if the amount of sunlight is 1.1 hours.. Cancel Done 中。
Suppose the correlation between variables x and y isr = – 1. Also suppose that the data contains the points (6, 14) and (2, 18). Finally, suppose that the x-values in the data set are: æ 2 3 5 6 8 Make a scatterplot of this data set. 20+ 19 18 17 16 15 14 13 12 10 8 6 6
Calculate the correlation coefficient r, letting Row 1 represent the x-values and Row 2 the y-values. Then calculate it again, letting Row 2 represent the x-values and Row 1 the y-values. What effect does switching the variables have on r? Row 1 19 23 31 49 51 70 79 Row 2 156 155 190 141 202 191 181 Calculate the correlation coefficient r, letting Row 1 represent the x-values and Row 2 the y-values. r= 0.430 (Round to three decimal places as needed.) Calculate the correlation coefficient r, letting Row 2 represent the x-values and Row 1 the y-values. (Round to three decimal places as needed.)
Which of the following correlation coefficients might lead a researcher to conclude that there is a weak, but significant, negative linear relation between variables X and Y? a. r=0.99 b. r=0.30 c. r=0 d. r=-0.30 c. r=-0.99
question 9
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Consider the following table of data. 2 3 4 y 1 1 1 1.1 (a) Calculate the correlation coefficient. (b) Sketch a graph of the data. (c) Based on how closely the data fits a straight line, is your answer to part (a) surprising? Discuss the extent to which the correlation coefficient describes how well the data fit a horizontal line.
a. The line that is closest to the points and its direction tells the direction of correlation that exists between the variables.trendlinescatterplotcartesian planefrequency polygon b. The following statements are true EXCEPT:A positive correlation exists when high values of one variable correspond to high values in the other variable.A negative correlation exists when high values in one variable corresponds to low values in one variable.A zero correlation exists when high values in one variable corresponds to neither high or low values in the other varA positive correlation exist when low values of one variable corresponds to low values in the other variable. c. The important numerical value in hypothesis testing isparametersample valueconclusioninterpretationd. Which of the following best represents a set of numerical data?meanproportionvariancerangee. In the analysis of a scatterplot, the element/s that should be considereddirectionstrength of correlationboth direction and…
Question 2 Find the line of best fit for the data set: (1,2), (2,3), (4,1). y = 3 – x Oy = 2 - Oy = 3 –z Oy =2-z
question 6
Calculate the correlation coefficient r, letting Row 1 represent the x-values and Row 2 the y-values. Then calculate it again, letting Row 2 represent the x-values and Row 1 the y-values. What effect does switching the variables have on r? Row 1 14 25 36 45 59 66 80 Row 2 162 166 160 106 139 143 156 Calculate the correlation coefficient r, letting Row 1 represent the x-values and Row 2 the y-values. (Round to three decimal places as needed.)

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Draw the distribution of points in the x, y coordinate system 2. Make an equation of the line 3. Calculate the correlation coefficie