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Which of the following statements is true? I. A correlation matrix is always symmetric. II. The diagonal entries of a correlation matrix are always 1.
Which of the following statements is true?
I. A correlation matrix is always symmetric.
II. The diagonal entries of a correlation matrix are always 1.
III. Every correlation matrix is positive-definite.
a. | II and III | |
b. | I and II | |
c. | I and III | |
d. | All of them |
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