Stat1600
Midterm #1
October 7, Form A
Name:
Note: Z Table is attached (page 4).
1. On the average, a watch battery is known to last for 2 years (24 months), with a standard deviation of
8 months. Assuming that the population is normally distributed. (Hint
Stat1600
Midterm #1
Solution, Form A
1. The high temperature on Jan 30th (in F.) for the last 5 years in a northern U.S. city is as
follows:
23,30,25,24,28
(a) (10 points) Calculate the mean, X of this data.
ANSWER: 26
CALCULATION/REASON: (show your work)
Stat1600
Midterm #2
November 16, Form A
Name:
Note: Tables are attached (pages 5).
1. According to the 2009 current Population Survey conducted by the U.S. Census Bureau, 40% of the
U.S. population 25 years old and over have completed a bachelors degree o
Stat1600
Midterm #2
Solution to Form A
1. Of 100 adults selected randomly from one town, 64 have health insurance. A researcher
wants to construct a 95% condence interval for the percentage of all adults in the town who
have health insurance.
(a) (10 poin
S160 #10
The Binomial Distribution, Part 2
JC Wang
February 13, 2014
TV World Example, revisited
Recall that, in TV World Example, historical data shows that
20% of TV buyers at TV World purchase extended warranty. X
extended warranties were sold along wi
Stat1600
Midterm #1
Solution, Form B
1. The high temperature on Jan 30th (in F.) for the last 5 years in a northern U.S. city is as
follows:
24,28,25,23,31
(a) (10 points) Calculate the mean, X of this data.
ANSWER: 26.2
CALCULATION/REASON: (show your wor
S1600 #8
The Normal Percentile
January 30, 2014
Revisiting TV+More Example
Question 2
Assumption: demand follows normal (bell-shaped) curve with
mean 36 and SD 8 TV sets per month. Given the cost of
running out of stock and the storage cost of keeping too
Stat1600
Solution to Midterm #1, Form A
1. Fred is in a weekly golf league. His scores from the last n = 21 weeks are shown in the
stem and leaf plot below:
-Leaf Unit = 1
7 6778
8 012349
9 01255
10 0112
11 01
-(So, for example, the first observation unde
S160 #9
The Binomial Distribution, Part 1
JC Wang
February 11, 2014
Binomial Process and Binomial Random Variable
A sequence of (xed) n observations is called a binomial
process if
each observation results in exactly one of two possible
outcomes (convenie
S1600 #5
Estimates of Center
January 21, 2014
Importance of Location and Spread
Comparison Boxplots
of Two Payment Types
Rent
Mortgage
500
1000
1500
2000
Monthly Payment
upon inspecting the plot, the central location of Rent
appears to be smaller than tha
Stat1600
Final Exam
Solution, Form A
1. (10 points) In a study of facial behavior, people in a control group are timed for eye contact
in a 5-minute period. Their times are normally distributed with a mean of 199 seconds. It
is known that approximate 95%
WORKSHOP 9
Submitted by:
According to the 2008 Current Population Survey conducted by the US. Census Bureau, 30%
of the U.S. population 24') years old and over have completed a bachelors degree or more. Given a.
random sample of 70 people 25 years
S1600 #1
Syllabus; Knowledge and Data
January 7, 2014
Course Home Page
www.stat.wmich.edu/wang/160
Lectures
lecture and workshop
50-minute lecture
25-minute hands-on workshop
10 points for each days work
3 lowest workshop scores will be dropped at the end
S1600 #2
Data Presentation #1
January 9, 2014
Statistics and Data
Statistics
Broader sense: collection of techniques/procedures for
analyzing data, i.e., Statistics = Data Analysis
Narrower sense: statistics = numbers derived from data
Data = table/spread
Stat1600
Final Exam (December 2010)
Form A
Name:
Note: Tables are attached (pages 5 & 6).
1. (10 points) A study was conducted in order to determine if any link existed between cellular phone
usage and the development of brain cancer. (Dont worry, no conn
S1600 #4
Data Presentation #3
January 16, 2014
Five-number Summary
Payment (Rent/Mortgage, outlier excluded), ACS Data
n = 63
(n + 1)/4 = 16
1st quarter of the data2nd
quarter of the data3rd quarter of the data4th quarter of the data
140 190 200 200 220 2
S1600 #7
The Normal Distribution
January 28, 2014
TV+More Example (page 38)
Assumption: demand follows normal (bell-shaped) curve
with mean 36 and SD 8 TV sets per month, evidenced by
past observations, and (assumed or believed) remains the
same present a
S1600 #6
Estimates of Spread
January 23, 2014
Estimates of Spread (or Uncertainty, Variation)
an estimate of spread is a measure of uncertainty, or
variation, or give or take
when two or more comparable data sets (comparable
means data sets are of same ty