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Module 1: Regression line

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The three-median regression example

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Core Mathematics - The three-median regression line example

The three-median regression line example

In general, the regression line for predicting y from x will be
different from the regression line for predicting x from y. The choice of
dependent variable is therefore an important one.

Record sales are noted in a store for 15 recordings for two consecutive
weeks.

WEEK 1
WEEK 2
WEEK 1
WEEK 2

55
230
240
280

75
220
260
250

100
210
270
260

120
245
280
280

160
210
290
265

220
215
300
300

225
240
330
285

230
240

Plot a scatterplot of these data and use the three median method to locate
a line of best fit for predicting week 2 sales from week 1 sales.

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