Question: The following data list worldwide shipments of personal computers (1,000) according to dataquest. Plot the data, fit a trend line, and discuss the strength of prediction of the regression model. In addition, explore a quadratic trend. Compare the results of the two models.

year shipments(1,000)

1985 14,705

1986 15,064

1987 16,676

1988 18,061

1989 21,327

1990 23,738

1991 26,966

1992 32,411

1993 38,851

1994 47,894

1995 60,171

1996 71,065

1997 82,400

1998 97,321