Question: Flights. The number of flights by U.S. Airlines has grown rapidly. Here are the number of flights flown in each year from 1995 to 2005.

a) Find the correlation of Flights with Year.

b) Make a scatterplot and describe the trend.

c) Note two reasons that the correlation you found in (a) is not a suitable summary of the strength of the association. Can you account for these violations of the conditions?

Year        Flights

1995       5,327,435

1996       5,351,983

1997       5,411,843

1998       5,384,721

1999       5,527,884

2000       5,683,047

2001       5,967,780

2002       5,271,359

2003       5,488,539

2004       5,129,270

2005       5,140,596