The numbers of North American cruise ship passengers are shown in Table 47 for various years.

Let y be the number (in millions) of North American cruise ship passengers in the year that is x years since 1980.
a. Construct a scatterplot.
b. Find a regression equation.
c. Describe the four characteristics of the association. Compute and interpret an appropriate correlation coefficient as part of your analysis.
d. Estimate the number of North American cruise ship passengers in 2010. What is the residual for the estimate? What does it tell you about the positions of the data point and the model?
e. The average amount of money spent per passenger was $1770 per week in 2013. Estimate the total amount of money spent by all passengers on North American cruise ships in 2013, assuming the average time passengers were on cruises was one week. Do you have much faith in this estimate? Explain.

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Table 4Z Numbers of North American Cruise Ship Passengers Number of Passengers (in millions) 1.4 2.2 3.8 4.7 7.2 11.2 14.2 Year 1980 1985 1990 1995 2000 2005 2010