In the January 2004 issue of Consumer Reports an article titled "Cut the fat" described some of the possible problems in the diets of the U.S. public. The following table gives data on the increase in daily calories in the food supply per person. Construct a time-series plot to display the increase in calorie intake.
| Year |
1970 |
1975 |
1980 |
1985 |
1990 |
1995 |
2000 |
| Calories |
3300 |
3200 |
3300 |
3500 |
3600 |
3700 |
3900 |
a. Describe the trend in calorie intake over the 30 years.
b. What would you predict the calorie intake was in 2005? Justify your answer by explaining any assumptions you are making about calorie intake.