2. If the coefficient of correlation is a positive value, thenthe intercept must also be positiveb. the coefficient of determination (R square) can be either negative or positive, depending onthe value of the slopethe slope of the line must be positived.a.с.the regression equation could have either a positive or a negative slope

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Answered: 2. If the coefficient of correlation 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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If the coefficient of determination is equal to 1, then the correlation coefficient A. must also be equal to 1 B. can be either -1 or +1 C. must be -1 D. can be any value between -1 to +1
21) Which of the following statements regarding the correlation coefficient is false? A) The correlation coefficient is a value between - 1 and 1. B) A correlation coefficient of - 1 means that as one variable increases, the other decreases. C) A high correlation coefficient tells us the data are linear.
If I conclude that as temperature increases, the number of snowboard sales decrease, this would be a negative correlation true or false?
A statement is made about correlation. State whether the correlation is positive or negative and whether the correlation is most likely due to coincidence, a common underlying cause, or a direct cause. If there is an underlying cause, state what the underlying cause is. If one directly causes the other, state which is the cause and which is the effect.(a) In Angela's class, the taller students got lower scores on the test.(b) As Thomas's income rose over the last 20 years so has his stress level.
A zero correlation bewteen X and Y is least likely to occur if?
The coefficient of correlation will be zero if if the relationship between two variables x and y is non-linear. if there is no linear relationship between two variables. if the covariance between two variables x and y is 1. None of the above.
1. If someone owns an electric car it is represented by a one and if they don’t it is represented by a zero. If someone owns an electric car and their yearly salary in pounds for four people are (0,80000), (0, 17000), (0, 37000) and (1, 58000) calculate the correlation coefficient.
1. If there is a strong correlation between two variables X and Y, then X causes Y or Y causes X. O True O False
Which of the following is true of the correlation r? It measures the strength of the straight-line relationship between two quantitative variables. It cannot be greater than 1 or less than 1. A correlation of +1 or –1 can only happen if there is a perfect straight-line relationship between two quantitative variables. Correlation is 0 only when there is no association between the variables. Correlation changes when the explanatory and response variables are switched.
True or false .If there is no linear correlation between enrollment and the number of burglaries , then those two variables are not related in anyway. Explain why ?
A history instructor has given the same pretest and the same final examination each semester. he is interested in determining if there is a relationship between the scores of the two tests. he computes the linear correlation coefficient and notes that it is 1.15. what does the correlation coefficient value tells the instructor? a. there is a strong positive correlation between the test b. there is a strong negative correlation between the test c. the history instructor has made a computational error d. the correlation is something other than linear
A student noticed that when she gets less than 8 hours of sleep at night, she scores lower on her test grades. Can one conclude that this positive correlation shows a causal relationship? OYes, because it is well known that less sleep lowers test scores OYes, because it is not a negative correlation O No, because all students get less than 8 hours of sleep at night No, because it is possible that the student gets lower test grades because of another factor, such as not studying

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