Scientific Research The following graph shows the percentage, above 25%, o...

Scientific Research The following graph shows the percentage, above 25%, of research articles in the prominent journal Physical Review that were written by researchers in the United States during 1983–2003 (t = 0 represents 1983).

a. Which of the following logistic functions best models the data? (t is the number of years since 1983 and P is the actual percentage.) Try to determine the correct model without actually computing data points.

b. According to the model you selected, how fast was the value of P declining around 1985?