Let's look again at our researcher's scatter diagram: (a) Look carefully at the way the scatter diagram relates to the estimated regression line which you drew in Problem 7.2.2(d). There appears to be a difficulty with the model. What is it? (b) A difficulty such as we've identified in part (a) may have a number of possible explanations. Suggest one possibility. (c) How would you deal with the difficulty we found in part (a)? (d) Restricting the model as suggested in part (c) would probably be very unsatisfactory for our researcher. Why?Problem 7.2.2(d):(d) Plot on the scatter diagram.
Let’s look again at our researcher’s scatter diagram: (a) Look carefully at the way the scatter…
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