Should I buy the iPad mini if I already have the iPhone 5?

I was planning on buying the iPad mini for school. Are they sort of the same thing or a bit different?

For me, In school, iPads are better with much bigger screen for ease of research compared with the iPhone 5.It is really not the same thing…

Ipad has a bigger screen, comparing it from an iphone and trust me a bigger screen is really necessary when talking about documents, books or games.

Ipad mini is better than iphone 5. Ipad mini has larger screen of 7 inch with 163 ppi which has a good display A5 chip with dual core just good enough for 7 inch tablet.while iphone 5 has 4 inch small display. So i prefer ipad mini

I use my ipad as a book reader (and browsing the net some, etc), so it depends what you want to use it for. No way am I reading books on a small phone screen.