21. Use the table, which shows the number of pounds of skim milk, y, consumed per
person in the United States in year x. Let x represent the number of years since
1980.
Х
1980
1985
1990
1992
1995
1996
Y
26.9
27.4
42.8
46.2
53.9
55.7
a. Use the model y = 2x + 23 to estimate the number of pounds
consumed in 1994. Is this linear interpolation or linear
extrapolation?
b.
Use the model y = 2x + 23 to estimate the number of pounds consumed in
1999. Is this linear interpolation or linear extrapolation?