Marine biologists warn that the growing number of powerboats registered in Florida threatens the existence of manatees. The data in the table come from the Florida Fish and Wildlife Conservation Commission (myfwc.com/research/manatee/) and the U.S. Coast Guard Office of Auxiliary and Boating Safety (www.uscgboating .org/library/accident-statistics/Recreational-Boating-Statistics- 2015.pdf).

a) In this context, which is the explanatory variable?
b) Make a scatterplot of these data and describe the association you see.
c) Find the correlation between Boat Registrations and Manatee Deaths.
d) Interpret the value of R².
e) Does your analysis prove that powerboats are killing manatees?

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Year 1982 1983 1984 1985 1986 1987 1988 1989 1990 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 Manatees Killed 23232238887848222582828285885288 13 21 16 20 15 39 50 49 81 95 69 79 92 90 97 81 69 86 Powerboat Registrations (In 1000s) 447 460 481 498 513 512 527 559 585 614 646 675 711 719 716 716 716 735 860 923 940 946 974 988 992 932 949 914 890 870 871 873.5 889