1. The mean age of five people in a room is 30 years. One of the people, whose age is 50 years,
leaves the room. The mean age of the remaining four people in the room
A) is 40.
B) is 30.
C) is 25.
D)
Chapter 4
Sample Surveys in the Real World
What Can Go Wrong?
Sampling and statistics seem simple, but
many problems can arise.
Example: Prediction poll mistake of the
1948 presidential election tha
Performing Regression Analysis in Microsoft Excel
Excel 2007 version and later
Shrager
Over the last few versions of Microsoft Office, the statistical tools embedded in Microsoft Excel have
become inc
Chapters 7- 8
Data Ethics and Measuring
Experimental Ethics
Are placebo surgeries ethical?
Sometimes There is No Question
Its Unethical!
Researcher fakes data.
Surveyor starts by saying You have
won
INTRODUCTION TO
PROBABILITY
WHAT TYPE OF PROBABILITY ARE YOU USING
WHEN DISCUSSING THE PROBABILITY OF THE
CLASSROOM BEING HOT TODAY?
A) Empirical (experimental) probability
B) Theoretical Probability
What makes a Difference?
The question is How different
must two means be before they are
considered statistically different?
1
Remember this
There is a well-known saying from
the field of Cybernetics:
Chapter 5
Observational Study or Experiment
Observational studies are _. We
do not assign choices; we simply observe
them.
_ are active. We
impose some _ in
order to see what happens. If properly
de
CHAPTER 13
Normal Distributions
Strategy for Exploring Data
on a Single Quantitative
Variable
(1)
(2)
(3)
(4)
Plot data using a histogram or stemplot
and look for the overall pattern.
Look for strikin
Some Relationships &
Scatterplots
Whats the (probable) relationship?
The distance driven on the New Jersey
turnpike and the amount of $ in tolls paid
a.
b.
c.
d.
Positive
Negative
No relationship
Can
Midterm Review Questions
1. The length of life of a random sample of incandescent light bulbs was obtained, and the
results are in the table.
Life
(hrs)
Count
500650
6
650-800
18
800950
60
950-1100 11
Combination Problems
Oral Exam Problem
Lucy is taking an oral exam that is being given by five professors.
Each professor decides independently if he thinks she has passed; if a
majority of them pass
Sec. 4.4 Example Problems
1. Let X ~ Bi(n, p). Derive the PMF of X.
2. Let X ~ Bi(n, p). Find:
a) E(X)
b) MGF of X.
c) Use the MGF to find: i) the mean ii) the variance
3. Every time an NFL kicker att
Sec. 4.2 & 4.9 Examples
1. Toss a fair coin 3 times. Find the expected number
of heads. What is the median number of heads?
2. Recall that for the envelope problem, the RV X = the
number of letters in
Sec.3.3Examples
1. Prove:
P( A B ) P( A) P ( B) P( AB)
2. Prove:P(AB)=P(A)P(B|A)=P(B)P(A|B)
3. Aspacecrafthasonboard3computers,A,B,andC,which
operateindependently.Theprobabilitiesthattheywillfunction
Sec. 2.4 Examples
Sandwich Problem
You are making sandwiches for a large event. You have available 3 different types
of breads, 6 different meats, and 4 different dressings. You will put one of each o
Chapter 6
Experiments in the Real World
If a subject does not respond to a
survey question, this is an example of
1) response error
2) non-response error
3) sampling error
4) processing error
Using th
Statistical Inference Estimating
Parameters
(select)
Population
Sample
(calculate)
(describes)
(estimate)
Parameter
Statistic
true proportion
sample proportion
true mean
sample mean
p as an Estimate o
Writing Assignment 4
In the article, Almonds have cholesterol benefits, researchers performed an
experimental study to determine the effects of almonds (at different consumption levels) on
lowering hi
Writing Assignment 3
On Thursday, December 22nd our AP Stats class conducted a taste test of three different
types or brands of cheesecakes (Brand A- Shop-Right New York Cheesecake, Brand B- Kirkland
Writing Assignment 1-2
2. Based on the scatter plot, the data of Armspan (in) vs. Height (in) has a positive and
linear relationship. The relationship starts out strong, but then the relationship grow
Writing Assignment 1
Estimated HIV diagnoses in 2009 by race/ethnicity:
The statistic that jumps out from this pie chart is that a little more than half of all people that were diagnosed
with HIV in 2
1. The length and width for a sample of products made by a certain company are plotted below.
220.0
h
t
g
n
e
L
200.0
180.0
160.0
140.0
60.0
65.0
70.0
75.0
80.0
Width
The correlation between length an
Topic 1 Review Questions
1. A survey of 1,000 adult Americans asked each whether the best way to fight terrorism is to let
the terrorists know we will fight back aggressively or to work with other nat
1.
Youadd7toeachvalueinadataset.Asaresult,thenewstandarddeviationofthedatasetis
2.
Ifthe99%confidenceintervalofthemeanofthepopulationis122.4,then
A)
B)
if1000samplesofthesamesizearecollected,about10of
Myth #1 The myth of short-run regularity.
Example:
In Basketball, a player has hot hands if they have made a lot of
shots in a row. They are not more likely to make the shot. They are
just playing con