Rolls of opinion polls during elections

Question 1

What are some key opinion polls?

Answer 1

Gallup (predict labour win in 1945), Ipsos Mori (sold data to EE), YouGov (established by conservatives in 2000 cheap and online), Opinium (established by the guardian in 2007 therefore left wing)

Question 2

Methods

Answer 2

Random digit dialling, internet surveys, exit polls

Question 3

Are the accurate and predicting results?

Answer 3

Cons predicted 47% and actual result 45%, Lab predicted 33%, actual result, 33%