Which of the following statements regarding the correlation is not true?
a.For any two random variables,
X and
Y,
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b.The correlation coefficient is equal to the covariance.
c.
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does not imply independence.
d.
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or
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if there is s perfect linear prediction in the population.
Question 2
Which of the following is the correct formula for the standard deviation of a discrete random variable X?
a.
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b.
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c.
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d.