When you multiply two negative numbers or two positive numbers then the product is always positive. The same also goes for dividing negative integers.

7 0

2 years ago

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Find the coefficient of correlation between and X and Y if covariance between X and Y is 15 and the variance of X and Y are resp

IRINA_888 [86]

Answer:

0.95

Step-by-step explanation:

$Correlation \ coefficient \ (r) = \dfrac{covaraince \ between \ X \ and \ Y }{SD_X \times SD_Y }$

$Correlation \ coefficient \ (r) = \dfrac{15 }{10^{1/2} \times 25^{1/2} }$

$Correlation \ coefficient \ (r) = \dfrac{15 }{3.162 \times 5 }$

$Correlation \ coefficient \ (r) = \dfrac{15 }{15.81 }$

$Correlation \ coefficient \ (r) \simeq 0.95$

5 0

2 years ago

Between which two consecutive integers<br> is 140<br> -?<br> 2

Goshia [24]

The value of the square root of 140 lies between 11 and 12. The square root of 140 is 11.83

5 0

2 years ago