Stats 250 F18 Exam 2 Solutions, Common Errors, and Reference
Page
Question
Points Possible
1
1
9
2
2
11
3
3
10
4
4
9
5
5
10
6
6
9
7
7
9
8
8
8
Total
--
75
Instructions:
1.
Fill in your name, UMID number, seat, and Lab Section with GSI name in the spaces provided above.
2.
You may use a calculator and the
provided
blue Stats Help Card. No other aids of any kind are permitted.
3.
Some questions require that you clearly write your final answer in a designated place
.
4.
No credit
will be given for providing only the answer without correct supporting work.
You must show how you arrived at your answer
(formula used, plug in values, draw a picture, etc.).
(Giving steps that are specific to your calculator is
not
sufficient work.)
5.
When appropriate
, you must carry out numerical answers to
4 decimal places
.
6.
Final answers must be legible and
clear
.
If multiple answers are given,
the worst will be graded.
7.
There are
8 pages
to your exam (excluding this cover page).
8.
Points for each question are indicated in square brackets
[X points]
.
9.
Exams are expected to be returned to students
electronically
by the end of next week.
10.
Please help us maintain the high standards of the University of Michigan. We are Michigan. And we are proud.
Excerpt from the LSA Academic Integrity Statement: “…The College holds all members of its community to high standards of scholarship
and integrity. To accomplish its mission of providing an optimal educational environment and developing leaders of society, the College
promotes the assumption of personal responsibility and integrity and prohibits all forms of academic dishonesty and misconduct.
Academic dishonesty may be understood as any action or attempted action that may result in creating an unfair academic advantage
for oneself or an unfair academic advantage or disadvantage for any other member or members of the academic community...”
No questions will be answered during the exam
.
Answer each question the best you can.
Make sure you include relevant formulas with notation and your calculations.
Good Luck!
Required
:
Review instructions
and initial here

1.
Home for the Holidays ~
Thanksgiving week is one of the most traveled weeks of the year. University officials
at Southern University wish to assess if there is a
significant difference
between the proportion of in-state
students and the proportion of out-of-state students who travel over Thanksgiving break. Independent
random samples of such students were surveyed and their responses are reported below.
Are you traveling over Thanksgiving break?
Yes
No
Total
1 = In-State
64
16
2 = Out-of-State
56
28
a.
Use the data above to provide an estimate of the common population proportion. Include the appropriate
symbol with your final answer.
[3]
80
84

F18 Exam 2 page 1