We have data on the distance covered by irrigation water in a furrow of a field. The

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We have data on the distance covered by irrigation water in a furrow of a field. The data are to be used to relate the distance covered to the time since watering began. The data are given in Table 8.28.

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(a) Perform a simple linear regression relating distance to time. Plot the residuals against time. What does the plot suggest?

(b) Perform a regression using time and the square of time. Interpret the results. Are they reasonable?

(c) Plot residuals from the quadratic model. What does this plot suggest?

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Statistical Methods

ISBN: 9780128230435

4th Edition

Authors: Donna L. Mohr, William J. Wilson, Rudolf J. Freund

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Question Posted: Mar 28, 2024 04:16 AM

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We have data on the distance covered by irrigation water in a furrow of a field. The

Question:

Table 8.28 Distance covered by irrigation water. Obs Distance Time 10 11 12345678DDNSS 85 0.15 169 0.48 251 0.95 315 1.37 408 2.08 450 2.53 511 3.20 590 4.08 9 664 4.93 703 5.42 831 7.17 906 8.22 13 1075 10.92 14 1146 11.92 15 1222 13.12 16 1418 15.78 17 18 19 782 1641 18.83 1914 21.22 1864 21.98

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Statistical Methods

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