If cov (x,y) = 0 is zero, then is ______ correlation.Select one:a.positiveb.negativec.zerod.none of theseClear my choice

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Answered: If cov (x,y) = 0 is zero, then is…

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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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 20 23 34 44 51 69 73 Row 2 148 148 114 131 124 185 112 Calculate the correlation coefficient r, letting Row 1 represent the x-values and Row 2 the y-values. r= (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. r= (Round to three decimal places as needed.) What effect does switching the variables have on the correlation coefficient? The correlation coefficient when the x-values and y-values are switched.
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Let x be the average number of employees in a group health insurance plan, and let y be the average administrative cost as a percentage of claims. 3. 15 37 71 y 40 35 30 27 19 n USE SALT (a) Make a scatter diagram of the data and visualize the line you think best fits the data. 40 40 40 35 35 35 30 30 25 25 25 10 20 30 40 50 60 70 10 20 30 40 50 60 60. 70 70 10 20 30 40 50 X (average number X (average number X (average number of employees) of employees) of employees) 40 35 30 25 10 20 30 40 50 60 70 X(average number of employees) (b) Would you say the correlation is low, moderate, or strong? positive or negative? strong and positive ManRook Dro y (average cost y (average cost as percentage) as percentage) 20 20 30 y (average cost as percentage) 20 y (average cost as percentage) 20
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The following data was collected to explore how the average number of hours a student studies per night and the student's GPA affect their ACT score. The dependent variable is the ACT score, the first independent variable (x1) is the number of hours spent studying, and the second independent variable (x2) is the student's GPA. Effects on ACT Scores Study Hours GPA ACT Score 0 2 17 1 2 20 3 2 25 5 4 26 5 4 26 Copy Data Step 2 of 2: Determine if a statistically significant linear relationship exists between the independent and dependent variables at the 0.05 level of significance. If the relationship is statistically significant, identify the multiple regression equation that best fits the data, rounding the answers to three decimal places. Otherwise, indicate that there is not enough evidence to show that the relationship is statistically significant. Answer How to enter your answer (opens in new window) 2 Points Keypad Keyboard Shortcuts Selecting a checkbox will replace the entered…
A recent survey reported that small businesses spend 29 hours a week marketing their business. A local chamber of commerce claims that small businesses in their area are not growing because these businesses are spending less than 29 hours a week on marketing. The chamber conducts a survey of 98 small businesses within their state and finds that the average amount of time spent on marketing is 27.6 hours a week. Assuming that the population standard deviation is 8.1 hours, is there sufficient evidence to support the chamber of commerce's claim at the 0.01 level of significance? Step 2 of 3: Compute the value of the test statistic. Round your answer to two decimal places.
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The following data was collected to explore how the average number of hours a student studies per night and the student's GPA affect their ACT score. The dependent variable is the ACT score, the first independent variable (x1�1) is the number of hours spent studying, and the second independent variable (x2�2) is the student's GPA. Effects on ACT Scores Study Hours GPA ACT Score 11 22 1818 55 22 2727 55 33 2929 66 33 3131 66 33 3131 Copy Data Step 1 of 2 : Find the p-value for the regression equation that fits the given data. Round your answer to four decimal places

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If cov (x,y) = 0 is zero, then is ______ correlation. Select one: a. positive b. negative c. zero d. none of these Clear my choice