2. Is there an association between
the number of times a person’s
cell phone is taken away and
their gender?
Is there an association between
the number of times a person’s
cell phone is taken away and
their grade?
4. Tests
• Chi-squared test for homogeneity to see if the
distribution of the number of times boys get
their cell phones taken away compared to the
number of times girls get their phones taken
away is the same.
• Two prop z-test to see if the proportion of
boys who never get their cell phones taken
away is less than girls who never got their cell
phones taken away
total 48 52
5. Tests cont’d…
• Chi-squared test for independence to see if
there is an association between the grade
level and the number of times cell phones
were taken from students
0
2
4
6
8
10
12
14
16
18
20
Freshman Sophmores Junior Seniors
Never
Once
2+
6. Results
• Chi-squared test for homogeneity: We lack
evidence to suggest that the distributions
between the number of times boys and girls
get their cell phones taken away are different.
We fail to reject Ho, and accept that boys and
girls at JCHS get their cell phones taken away
the same amount of times.
7. Results
• Two prop z test: We lack evidence to suggest
the proportion of boys who never get their
cell phones taken away is significantly less
than the proportion of girls who never get
their cell phones taken away. We accept the
null hypothesis that these proportions are the
same due to a high p-vale in which we failed
to reject Ho.
8. Results
• Chi-squared test for Independence: Once
again, we lack evidence to conclude that there
is an association between grade level and the
number of times a cell phone is taken away,
accepting the null hypothesis, that they are
independent of one another.
9. Conclusion
• We were somewhat surprised to find that it does not
matter whether you are a boy or girl, freshman,
sophomore, junior, or senior, the chances of one
getting their cell phone taken away is basically equal.
This shows that there is no discrimination when a cell
phone is taken away, teachers and administration
are not more lenient to a certain sex or grade level,
which is good. With this study we can conclude that
the only way to lower the probability of getting one’s
cell phone taken away is to simply not use it in
school!
10. Conclusion
• We were somewhat surprised to find that it does not
matter whether you are a boy or girl, freshman,
sophomore, junior, or senior, the chances of one
getting their cell phone taken away is basically equal.
This shows that there is no discrimination when a cell
phone is taken away, teachers and administration
are not more lenient to a certain sex or grade level,
which is good. With this study we can conclude that
the only way to lower the probability of getting one’s
cell phone taken away is to simply not use it in
school!
