14.20. For data from 2005 to 2011 from Facebook on y = number of people (in millions)...
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14.20. For data from 2005 to 2011 from Facebook on y =
number of people (in millions) worldwide using Facebook, the prediction equation ˆy = 2.13(2.72)x fits well, where x = number of years since January 1, 2005.
(a) Predict the number using the Internet at the beginning of (i) 2005 (take x = 0), (ii) 2011.
(b) Interpret the estimate 2.72.
(c) Illustrate the dangers of extrapolation, by predicting y on January 1, 2015.
(d) The straight-line model fitted to the data gives ˆy =
−114 + 95x. Explain why this model is inappropriate for these data.
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Related Book For
Statistical Methods For The Social Sciences
ISBN: 9781292220314
5th Global Edition
Authors: Alan Agresti
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