Poll: The programme is on ____ at 6pm.
The programme is on ____ at 6pm.
'every day' is an adverb; 'everyday' is an adjective - used before a noun, as in 'an everyday occurence'. contrast that with 'it happens every day' - used as an adverb.
Sandy is perfectly correct. So who are these people taking the poll and, by a slim majority, giving the wrong answers?