Boy Mow Chau's answer to Yutong's Junior College 2 H2 Maths Singapore question.
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(i) note that (x bar, y bar) satisfies equation of both regression lines.
(ii) for an estimate to be reliable, ...
- the point to be estimated must lie within data range, (because we cannot predict the behavior of the data values outside the data range).
- must have strong (positive or negative) correlation between the 2 given quantities.
for this question, we do not have any information about the range of data values, but correlation of -0.3 is clearly weak.
(ii) for an estimate to be reliable, ...
- the point to be estimated must lie within data range, (because we cannot predict the behavior of the data values outside the data range).
- must have strong (positive or negative) correlation between the 2 given quantities.
for this question, we do not have any information about the range of data values, but correlation of -0.3 is clearly weak.
Date Posted:
2 years ago
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