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A. -0.06 B. 0 C. 0.11 21. Which of the following statements about correlation is NOT correct? A. Every correlation has strength only. B. Correlation is a number from -1 and 1. C. A correlation can either be positive or negative. D. Correlation determines the direction between two variables strength of the relationship between two variables. What is th

A. -0.06 B. 0 C. 0.11 21. Which of the following statements about correlation is NOT correct? A. Every correlation has strength only. B. Correlation is a number from -1 and 1. C. A correlation can either be positive or negative. D. Correlation determines the direction between two variables strength of the relationship between two variables. What is th

MATLAB: An Introduction with Applications
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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10. The direction of the points around the line in a scatter plot suggests the of the variables. C. trend B. shape A. fo D. vation/strength 11. If the points the scatter graph rise from left to right, then the variables inve have a correlation. J. Zero C. positive A. moderate B. negligible of the s to the trend on a 12. The strength of the colation is associated with the scatter plot. D. number C. form B. action A. closeness 13. Noah noticed that the points a scatter plot follow and rising from right to left. He also noticed that the points are plotted losely around the trid line. What is the correlation of the variables involved? C. weak negative A. strong negative B. strong positive D. weak positive 14. If the points on the scatter plot fall almost ne, then the variables are said to have correlation. D. strong C. positive A. negative B. perfect 15. Joan noticed that the high value of e variable responds to high value of the second variable or low value of the first corresponds low value of send variable. What conclusion can you draw from the direction of correlation? B. he variables have positive correlation. D. T variables have moderate correlation. A. The variables have 7 o correlation. C. The variables have negative correlation. 16. Which of the following used to measure the strength the association between bivariate data? B. diagram A. z - value C. Pearson - D. Pearson's ample correlation coefficient 17. In the formula of earson r, what is the meaning of Exy? A. sum of x-va des B. sum of square x-valus C. sum of the square of paired values x and y 18. In computing Pearson r, which of the following entries in all col mns in the table? D. sum of the products of paired values x and y is the next step after obtaining the sum of all A. Construct a table. B. Complete the table. C. Sinplify and compute for the value of r. 19. Which of he following is the range of the correlation B. 1 ≤rs-1 D. Substitute all the sum and n in the formula. coefficient (r)? C. -1 <r < 1 Asrs 1 D. -1 ≤rs 1 20. Using the given summation values below, what is the value of Pearson r? n = 3 Σχ = 10 Σy = 15 Σxy = 60 Ex? = 14 Σy2 = 450 A. -0.06 B. O C. 0.11 D. 1 21. Which of the following statements about correlation is NOT correct? A. Every correlation has strength only. B. Correlation is a number from -1 and 1. C. A correlation can either be positive or negative. D. Correlation determines the direction between two variables 22. Miguel needs to analyze the strength of the relationship between two variables. What is the correct statistical method he needs to conduct? A. Z-test B. Pearson co C. Pearson alpha D. Pearson's sample correlation coefficient 23. Which of the following Pearson coefficients is considered having the weakest negative correlation? A. 0.45 B. -0.1 24. There is a survey indicating that as weather gets colder, air-conditioning C. -0.45 D. -0.98 costs decrease. Which of the following values of r is appropriate to the result of the survey? C. 0.19 A. -0.93 B. 0 D. 0.87 25. The correlation coefficient r between the number of bags of popcorn and the number of sodass sold at each performance of the circus over one week was found to be 0.62. Which conclusion can be drawn from the result? A. There is no correlation between popcorn sales and soda sales. B. There is a strong positive correlation between popcorn sales and soda sales. C. There is a weak positive correlation between popcorn sales and soda sales. D. There is a strong negative correlation between popcorn sales and soda sales.
Transcribed Image Text:10. The direction of the points around the line in a scatter plot suggests the of the variables. C. trend B. shape A. fo D. vation/strength 11. If the points the scatter graph rise from left to right, then the variables inve have a correlation. J. Zero C. positive A. moderate B. negligible of the s to the trend on a 12. The strength of the colation is associated with the scatter plot. D. number C. form B. action A. closeness 13. Noah noticed that the points a scatter plot follow and rising from right to left. He also noticed that the points are plotted losely around the trid line. What is the correlation of the variables involved? C. weak negative A. strong negative B. strong positive D. weak positive 14. If the points on the scatter plot fall almost ne, then the variables are said to have correlation. D. strong C. positive A. negative B. perfect 15. Joan noticed that the high value of e variable responds to high value of the second variable or low value of the first corresponds low value of send variable. What conclusion can you draw from the direction of correlation? B. he variables have positive correlation. D. T variables have moderate correlation. A. The variables have 7 o correlation. C. The variables have negative correlation. 16. Which of the following used to measure the strength the association between bivariate data? B. diagram A. z - value C. Pearson - D. Pearson's ample correlation coefficient 17. In the formula of earson r, what is the meaning of Exy? A. sum of x-va des B. sum of square x-valus C. sum of the square of paired values x and y 18. In computing Pearson r, which of the following entries in all col mns in the table? D. sum of the products of paired values x and y is the next step after obtaining the sum of all A. Construct a table. B. Complete the table. C. Sinplify and compute for the value of r. 19. Which of he following is the range of the correlation B. 1 ≤rs-1 D. Substitute all the sum and n in the formula. coefficient (r)? C. -1 <r < 1 Asrs 1 D. -1 ≤rs 1 20. Using the given summation values below, what is the value of Pearson r? n = 3 Σχ = 10 Σy = 15 Σxy = 60 Ex? = 14 Σy2 = 450 A. -0.06 B. O C. 0.11 D. 1 21. Which of the following statements about correlation is NOT correct? A. Every correlation has strength only. B. Correlation is a number from -1 and 1. C. A correlation can either be positive or negative. D. Correlation determines the direction between two variables 22. Miguel needs to analyze the strength of the relationship between two variables. What is the correct statistical method he needs to conduct? A. Z-test B. Pearson co C. Pearson alpha D. Pearson's sample correlation coefficient 23. Which of the following Pearson coefficients is considered having the weakest negative correlation? A. 0.45 B. -0.1 24. There is a survey indicating that as weather gets colder, air-conditioning C. -0.45 D. -0.98 costs decrease. Which of the following values of r is appropriate to the result of the survey? C. 0.19 A. -0.93 B. 0 D. 0.87 25. The correlation coefficient r between the number of bags of popcorn and the number of sodass sold at each performance of the circus over one week was found to be 0.62. Which conclusion can be drawn from the result? A. There is no correlation between popcorn sales and soda sales. B. There is a strong positive correlation between popcorn sales and soda sales. C. There is a weak positive correlation between popcorn sales and soda sales. D. There is a strong negative correlation between popcorn sales and soda sales.
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