Scientific Research The following chart shows some the data shown in the g...

Scientific Research The following chart shows some the data shown in the graph in Exercise 23 (t = 0 represents 1983).

a. What is the logistic regression model for the data? (Round all coefficients to 2 significant digits.) At what value does the model predict that the number of research articles will level off? HINT [See Example 2.]

b. According to the model, how many Physical Review articles were published by U.S. researchers in 2000 (t = 17)? (The actual number was about 5,500 articles.)