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What kind of relationship between X and Y is indicated , if the points of the scattered diagram tend to cluster about (i) a straight line parallel to the X-axis (ii) a straight line parallel to the Y-axis (iii) a straight line sloping upward ,and (iv) straight line sloping downward ? |
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Answer» i) If the points of the scattered diagram tend to cluster about a straight line parallel to the X-axis, there is no correlation between X and Y. ii) If the points of the scattered diagram tend to cluster about a straight line parallel to the Y-axis, there is no correlation between X and Y. iii) If the points of the scattered diagram tend to cluster about a straight line sloping upward, then there is a case of perfect positive correlation between X and Y. iv) If the points of the scattered diagram tend to cluster about a straight line sloping downward, then there exists perfect negative correlation between X and Y. |
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