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VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE General & Further Mathematics => Topic started by: inneedoftherapy on October 28, 2013, 01:45:26 pm

Title: Box plot question?!!??!
Post by: inneedoftherapy on October 28, 2013, 01:45:26 pm

Hey guys,
Quick question. How would I describe these box plots (is it negatively, positively skewed!??!?)since the length of the whiskers don't correspond to the median, if you know what I'm saying! It's a bit odd, questions don't ask but just incase it pops up, what feature would I be looking at!? The length of the whisker?? Or the location of the median??!

Thanks!!

Title: Re: Box plot question?!!??!
Post by: Colokid on October 28, 2013, 03:31:10 pm

A would be a negative skew
B would be a positive skew

Title: Re: Box plot question?!!??!
Post by: inneedoftherapy on October 28, 2013, 05:26:44 pm

Hey, thanks ! But why is it positive and negative skew ?

Title: Re: Box plot question?!!??!
Post by: BLACKCATT on October 28, 2013, 05:36:48 pm

For boxplot A it is tailing to the left (majority of values are on the right) thus it is negatively skewed
For boxplot B it is tailing to the right (majority of values are on the left) thus it is positively skewed

Title: Re: Box plot question?!!??!
Post by: #J.Procrastinator on October 28, 2013, 06:04:20 pm

The distribution of boxplot A is negatively skewed as the values are stretched more to the left. Have a look at the median, is it further towards the upper end or lower end? It's closer to the upper end (the right), hence more values lie on the left.

Boxplot B is positively skewed as the data values are stretched more to the right. More values appear on the right hand side of the median.

Hope this helps! :)

Title: Re: Box plot question?!!??!
Post by: inneedoftherapy on October 29, 2013, 04:15:03 pm

Hey thanks j procastinator!

Title: Re: Box plot question?!!??!
Post by: #J.Procrastinator on October 29, 2013, 05:59:41 pm

Quote from: inneedoftherapy on October 29, 2013, 04:15:03 pm

Hey thanks j procastinator!

You're welcome, glad to help out anytime :)