13. In a simple linear regression problem, r and b 1 A)must have opposite signs.

Question

13. In a simple linear regression problem, r andb1 A)must have opposite signs.
B)may have opposite signs.
C)must have the same sign.
D)are equal.
14. The sample correlation coefficient between X andY is 0.375. It has been found that the p-value is0.256 when testing H0 : = 0against the two-sided alternative H1 : 0. To test H0 : = 0 against the one-sided alternativeH1 : < 0 at a significancelevel of 0.2, the p-value is: A)0.256/2
B)1 - 0.256/2
C)(0.256)2
D)1 - 0.256
15. Assuming a linear relationship between X andY, if the coefficient of correlation (r) equals -0.30, A)the slope (b1) is negative.
B)variable X is larger than variable Y.
C)there is no correlation.
D)the variance of X is negative.
13. In a simple linear regression problem, r andb1 A)must have opposite signs.
B)may have opposite signs.
C)must have the same sign.
D)are equal.
In a simple linear regression problem, r andb1 14. The sample correlation coefficient between X andY is 0.375. It has been found that the p-value is0.256 when testing H0 : = 0against the two-sided alternative H1 : 0. To test H0 : = 0 against the one-sided alternativeH1 : < 0 at a significancelevel of 0.2, the p-value is: A)0.256/2
B)1 - 0.256/2
C)(0.256)2
D)1 - 0.256
14. The sample correlation coefficient between X andY is 0.375. It has been found that the p-value is0.256 when testing H0 : = 0against the two-sided alternative H1 : 0. To test H0 : = 0 against the one-sided alternativeH1 : < 0 at a significancelevel of 0.2, the p-value is: A)0.256/2
B)1 - 0.256/2
C)(0.256)2
D)1 - 0.256
The sample correlation coefficient between X andY is 0.375. It has been found that the p-value is0.256 when testing H0 : = 0against the two-sided alternative H1 : 0. To test H0 : = 0 against the one-sided alternativeH1 : < 0 at a significancelevel of 0.2, the p-value is: 15. Assuming a linear relationship between X andY, if the coefficient of correlation (r) equals -0.30, A)the slope (b1) is negative.
B)variable X is larger than variable Y.
C)there is no correlation.
D)the variance of X is negative.
15. Assuming a linear relationship between X andY, if the coefficient of correlation (r) equals -0.30, A)the slope (b1) is negative.
B)variable X is larger than variable Y.
C)there is no correlation.
D)the variance of X is negative.
Assuming a linear relationship between X andY, if the coefficient of correlation (r) equals -0.30,

Explanation / Answer

13) C) is the correct one . 14)C)0.256*2 15)A)The slope is negative.

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