Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Midterm prep guide: Stat 203 Online, June 2013
Example questions:
1. Find the (a) mean and (b) standard deviation of the following data, or explain why you cant:
Key pages: Mean pp 8590, Standard Deviation pp 112118
Number of Ties owned
0
1
2
3
4
Freque
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Jan 20th 2017
4.27
a) Time is the explanatory variable; the scatter plot graph shows a strong positive linear
association between time and distance.
b) Divide all the z values by 5. (3.07 + 0.23 +
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Jan 20th 2017
1.23
a) The individuals described in this data set are Laurie Abrams, Gordon Brown, Maria
Cabrera, and Miranda Ismael who all finished medical school and are now seeking for
residenci
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Feb 1st 2017
Stat 203 Assignment 2
9.38
a) The explanatory variable was what texting method these children used and the
response variable is the WRAT spelling subtest scores.
b) This is an observat
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Feb 1st 2017
Stat 203 Assignment 2
8.36
The bias shown is probably from the fact that people are not completely transparent
when answering questions that have a relation to the law. Not having a se
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Jan 20th 2017
2.32
a) We prefer a histogram of the percentages rather than using the frequency as it can
get confusing where the data is concentrated when comparing two different data sets
with dif
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Jan 20th 2017
2.31
a) This data distribution of guinea pig survival times is rightskewed with the median
around 100 days, and range from about 0600.
b) Since the data is strongly rightskewed, I
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Feb 1st 2017
Stat 203 Assignment 2
8.32
a) The poll has in mind the adults of each household usually 4050 years of age that
watches movies of any frequency.
b) 2000831=1169 the nonresponse rate i
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Jan 20th 2017
1.30
The distribution is nonsymmetric and skewed to the right; positively skewed. The center
of the distribution is at 2 servings of fruit per day.
Range = 15  3 = 12
Q2=2(median)
Q
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Jan 20th 2017
4.28
a) The response and explanatory variables of new adults and percentage of returning birds have a
negative correlation and is linear. Correlation r is an appropriate measure of th
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Feb 1st 2017
Stat 203 Assignment 2
9.32
a) The explanatory variable is how much exercise a person got and the response
variable is how much efficient and long each persons sleep cycle was.
b) Subje
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
March 8th 2017
Stat 203 Assignment 4
17.32
A.
H0: = 5.19
HA: 5.19
B.
H0: = 5.19
HA: 5.19
Sample mean = 5.29
Standard deviation = 0.78
SE = 0.78/12.1655
Standard error of the mean = 0.0641
z = (xbar
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
March 8th 2017
Stat 203 Assignment 4
14.32
A. It is a binomial distribution as the population is essentially infinite and the tests are
independent thus having only two options.
B. The mean number
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
March 8th 2017
Stat 203 Assignment 4
16.27
A.
A stem plot will show no strong nonnormality in the sample, which suggests the
population, is also plausibly normal. Its about satisfying the conditio
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
March 8th 2017
Stat 203 Assignment 4
16.26
A.
B. One Sample ttest
99% confidence interval: 4.570 to 2.605
Sample estimates: mean of x = 3.587
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
March 8th 2017
Stat 203 Assignment 4
17.41
Yes, the data give good evidence because the standard deviation is 2.5% which the
interval includes only negative numbers as a result therefore it means t
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
QUIZ#4
We wish to see if, on average, trafc is moving at the posted speed limit of 65 miles per hour
along a certain stretch of Interstate 70. On each of four randomly selected days, a randomly
selected car. is timedand the speed of the car is recorded.
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Feb 1st 2017
Stat 203 Assignment 2
8.28
a) Adult residents are exposed to a lot influence such as media that could make them
biased making the survey limited. They may hear information about anothe
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Jan 20th 2017
4.31
Relative Risk vs Intake:
a) Refer to the graph above.
b) The pattern of the risk shows us the negative correlation between the two
variables. The scatterplot graph shows there is
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Samuel Choi 301310974 (worked with Leo Li)
Statistics 203
Jan 20th 2017
1.32
a) Ignoring the outliers, the shape of the distribution of the monthly returns is symmetric
and not skewed in any direction.
b) The approximate center of the distribution is 48 m
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Statistics 203
Assignment 2
Note: You do not need a title page (waste of paper). However, please make sure that your
assignments are legible (typed or neatly handwritten) and include your name and student
number on the front page. Staple the pages togeth
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Statistics 203
Assignment 1
Note: You do not need a title page (waste of paper). However, please make sure that your
assignments are legible (typed or neatly handwritten) and include your name and student
number on the front page. Staple the pages togeth
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Midterm prep guide: Stat 203 Online, June 2013
Example questions:
1. Find the (a) mean and (b) standard deviation of the following data, or explain why you cant:
Key pages: Mean pp 8590, Standard Deviation pp 112118
Number of Ties owned
0
1
2
3
4
Freque
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Statistics 201
Sample Midterm 1
DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO!
Instructions:
1.
2.
3.
4.
5.
Read all questions carefully
You may not share materials during the exam
Show all of your work
Define all variables/events used in your solutio
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Statistics 203
Assignment 5
Note: You do not need a title page (waste of paper). However, please make sure that your
assignments are legible (typed or neatly handwritten) and include your name and student
number on the front page. Staple the pages togeth
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Statistics 203
Midterm 1
DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO!
Name:
_
Student Number:
_
Signature:
_
Instructions:
1. Do not panic. It rarely helps.
2. Read all questions carefully.
3. You do not need to provide an explanation for multiple
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Statistics 203
Assignment 3
Note: You do not need a title page (waste of paper). However, please make sure that your
assignments are legible (typed or neatly handwritten) and include your name and student
number on the front page. Staple the pages togeth
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
SOLUTIONS
Statistics 203
Spring 2015
Midterm 1
DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO!
Name:
_
Student Number:
_
Signature:
_
Instructions:
1.
2.
3.
4.
5.
6.
7.
Do not panic. It rarely helps.
Read all questions carefully.
You do not need to pr
Introduction to Statistics for the Social Sciences
STAT 203

Fall 2015
Econ 105 Spring 2011 Midterm 2
A
Econ 103
Fraser International College
Spring 2011
Midterm 2 A
Total time: 2 hours
Name_ Student # _
Mark_/54
Rules:
1. No electronic devices other than a nonprogrammable, nongraphing calculator.
2. No sharing of calculat