Slightly more than 1,600 of you answered 'yes' to the question 'I still giggle when I hear the phrase down under.
Approximately 1,645 people giggle when they hear the phrase "down under". 
mnli hypothesis: Approximately 1,645 people giggle when they hear the phrase "down under".  premise: Slightly more than 1,600 of you answered 'yes' to the question 'I still giggle when I hear the phrase down under.