Question

I created a survey to see if tobacco use increased for students while in college (see below). What hypothesis test should I use to test the data I collected and what level of significance would be appropriate? Thank you.

	How many cigs/day did you smoke b4 college?	How many cigs/day did you smoke while in college?
None:	10	2
1 to 3:	14	10
4 to 6:	9	12
7 to 9:	4	9
More than 10/day:	3	7
Total:	40	40

Answer 1

you need to check whether the students being in college affects they do smoking or not and with what frequency, you can use chi square test for independence of attributes

Null hypothesis : students being in college is independent of do smoking or not and with what frequency

Alternate hypothesis : students being in college is depend upon if they do smoking or not and with what frequency

An appropriate  level of significance should be 0.05 or 95%