The table below represents all life insurance policies (in millions) in force on the lives of U.S. residents for the years 1985 through 2014.

a. Use the method of least squares to fit a simple regression model to the data.
b. Forecast the number of life insurance policies in force for 2015 and 2016.
c. Construct 95% prediction intervals for the forecasts of part b.
d. Check the accuracy of your forecasts by looking up the actual number of life insurance policies in force for 2015 and 2016.

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No. of Policies No. of Policies Year Year (in millions) (in millions) 1985 386 391 2000 369 377 1986 2001 1987 1988 1989 1990 1991 395 391 394 389 375 2002 2003 2004 2005 2006 375 379 373 373 375 1992 1993 1994 1995 1996 1997 366 363 366 370 355 351 2007 2008 374 335 291 284 286 272 2009 2010 2011 2012 1998 1999 358 367 2013 275 278 2014