# Help with box plots please!!!

#### xjinax8807

##### New Member
I really need help with this problem.

Cassette versus Cd Sales] Has the increasing popularity of the compact disc (CD) affected sales of cassette tapes? Table 1.13 shows teh number of cassettes and CDS sold from 1990 to 1999.

Table 1.13 Sales (in millions) of full-length cassettes and CDs, 1990-1999:

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1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
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Full-length cass. 54.7 69.8 43.6 38.0 32.1 25.1 19.3 18.2 14.8 8.0
Full-length CDs 31.1 38.9 46.5 51.1 58.4 65.0 68.4 70.2 74.8 83.2

Make a graphical display to compare cassette and CD sales.

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Okay I actually tried it and I really think its wrong...

I made two box plots using those years and numbers...

box plot 1 using full length cassettes
box plot 2 using full length cds....

I made the two plots and I put the numbers on it...finding the median, mininimum, etc.... but honestly i think its all wrong. I tried to figure it out for hours and I'm not understanding it. Please please help!!! THANKSSSS

Last edited:

#### JohnM

##### TS Contributor
You need to do a scatter plot. Use CD sales as X, and cassette sales as Y. Your plot should show that, as CD sales increase, cassette sales tend to decrease.

I've attached an example. The decreasing trend is very clear.

#### xjinax8807

##### New Member
JohnM said:
You need to do a scatter plot. Use CD sales as X, and cassette sales as Y. Your plot should show that, as CD sales increase, cassette sales tend to decrease.

I've attached an example. The decreasing trend is very clear.

OMG thank you so much. that cleared up everything. thanksssss