f.) The economy of the United States has changed a lot since 1913, and it has had ups and downs. Pick a period of time in which the history and economy of the United States was more stable or less stable. For example, you may pick the end of World War II or the years around the Stock Market crash. Recalculate the whole exponential model for just that period of time. This means you are getting a new graph and new exponential equation for a smaller subset of the data. Write the new equation and R2 value.
g.) Explain which year you chose and why.
h.) Did your second model fit better or worse? How do you know?