C. Simplity 9. Which of the following is the range of the correlation coefficient (r)? C. -1
C. Simplity 9. Which of the following is the range of the correlation coefficient (r)? C. -1
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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Transcribed Image Text:C. Simplity
19. Which of the following is the range of the correlation coefficient (r)?
C. -1 <r < 1
B. 1 ≤rs-1
D. -1 ≤rs 1
A. 0≤r≤ 1
20. Using the given summation values below, what is the value of Pearson r?
n = 3 Σχ = 10 Σy = 15 Σxy = 60 Σx = 14 Σy2 = 450
A. -0.06
B. 0
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
C. -0.45
D. -0.98
24. There is a survey indicating that as weather gets colder, air-conditioning costs decrease. Which
of the following values of r is appropriate to the result of the survey?
A. -0.93
B. 0
C. 0.19
D. 0.87
25. The correlation coefficient r between the number of bags of popcorn and the number of sodas
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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