The following table shows the annual number of PhD graduates in a country in various fields.   Natural Sciences Engineering Social Sciences Education 1990 70 10 60 30 1995 130 40 100 40 2000 330 130 290 130 2005 490 370 450 210 2010 590 550 830 520 2012 690 590 1,000 900 (a)Use technology to obtain the regression equation and the coefficient of correlation r for the number of social science doctorates as a function of time t in years since 1990. (Round coefficients to three significant digits. Round your r-value to three decimal places.) y(t)= r=

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Chapter1: Functions And Models
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The following table shows the annual number of PhD graduates in a country in various fields.
  Natural
Sciences
Engineering Social
Sciences
Education
1990 70 10 60 30
1995 130 40 100 40
2000 330 130 290 130
2005 490 370 450 210
2010 590 550 830 520
2012 690 590 1,000 900
(a)Use technology to obtain the regression equation and the coefficient of correlation r for the number of social science doctorates as a function of time t in years since 1990. (Round coefficients to three significant digits. Round your r-value to three decimal places.)
y(t)=
r=
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