Abstract
I always wanted to know if teens drink coffee
daily during school days, particularly sophomores because I am one.
So I went out and surveyed the sophomore class and acquired an
answer. Before I could do anything else I needed to come up with my
question that I will be asking, my hypothesis and who to survey. I
wanted to know the true proportion of sophomores who drink coffee
during school so my question became “Do you drink one or more cups
of coffee during school days?” with answers yes and no. I believed
that less than 20% of the students drink coffee daily so my
hypothesis became that. After receiving a roster of the entire
school I learned that we only had about 330 sophomores at our school
which means I can only survey 30 of them so my sample isn’t greater
than 10% of my population. I collected all the names of the
sophomores and entered them into Minitab and had Minitab select 30
random students from the list of names. Once I had my sample I had
to retrieve their schedules so I could deliver my surveys to them in
their study halls; I did so by going to the main office. I only
received 28 back of the 30 so I considered the other two as
nonresponse bias. I started to run a 1 Z proportion test because I
only had one question and it is a proportion. While checking my
assumptions I realized that my sample was not normal because my n(p)
was less than 10, but I proceeded on. I discovered that the Z score
was -0.7559 and my P-Value was .2248 which led to my conclusion that
you can see in the Conclusion page!
