1.53 - things seem to be related inversely. But we cannot...

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1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 0 10 20 30 40 50 60 70 80 90 Sales of full-length cassettes and CDs, 1990-1999 Column B Column C Year Sales (in millions) 1.53 The sales of CDs increase steadily and the sales of cassettes decrease steadily.  These two 
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Unformatted text preview: things seem to be related inversely. But we cannot determine whether this is a causal relationship....
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