STATISTICS 7
Basic Statistics
Professor Jessica Utts
http:/www.ics.uci.edu/~jutts/7
Course Goals
Help you understand and appreciate how
statistics affects your daily life.
Teach you tools for understanding statistics
and statistical studies you encounte
Estimating population means
MOS5e chapter 11
Copyright Dr. Brigitte Baldi 2017
Population (all individuals)
Sample (! individuals)
! parameter
(only 1 value)
! statistic
(different values for
different random
samples)
population
sample
sampling
distribut
Statistics 7 Lecture A Winter 2016
Activity #3
Circle Disc. Section:
A1 (Thurs 11am)
A2 (Thurs 12pm)
A3 (Fri 3pm)
A4 (Fri 4pm)
TEAM MEMBERS: Write name and UCI Student ID#.
1._
3._
2._
4._
Each team must return all of your pigs to the TA at the end of dis
Statistics 7 Lecture A Winter 2016
Discussion Activity #2
Circle Disc. Section:
A1 (Thurs 11am)
A2 (Thurs 12pm)
A3 (Fri 3pm)
A4 (Fri 4pm)
TEAM MEMBERS: Write name and UCI Student ID#.
1._
3._
2._
4._
BACKGROUND: In this activity, you are going to work wit
140
Family Medicine
February 2002
Te a ching Inform ation M astery: The C ase of Ba by Jeff
a nd the Im p orta nc e of Ba yes The ore m
Da vid C. Slawson, MD; Allen F. Sha ughnessy, PharmD
The sensitivity and specificity of
diagnostic tests seem to be dif
Homework 8:
Chapter 13
10,14,22,25,33,37,45,49,53abd,and56
13.4
a) One population mean
b) The difference between the means of two populations
13.8
a) H o : o = 25 o where o is the mean speed of cars for a population of cars driving in a
neighborhood
b) H
Probability continuous
random variables
MOS5e chapter 8 sections 5 and 6
Copyright Dr. Brigitte Baldi 2017
Reminder:
Discrete vs. continuous sample spaces
Discrete sample space:
Undergraduate level
For a random student:
S = cfw_freshman, sophomore, junio
1) c) X is a binomial random variable with n=15 and p=0.4
2) b) 0.40951
3) a) 9
4) a) P(X > 1) = 1 - P(X = 0) = 1 - (0.65)^5
= 0.884%
b) Y= number of students who prefer Pepsi
Mean of Y= np = 50*0.35=17.5
c) P(Y > 26) = P(Z > (26-17.5)/3.373 ) = P(Z > 2.5
Sample Midterm 2 Free Response
1. In a study of acupuncture for treating pain, 100 volunteers were recruited. Half were randomly
assigned to receive acupuncture and the other half to receive a sham acupuncture treatment.
The patients were followed for
Sample Midterm 2 Multiple Choice Questions - SOLUTIONS
This scenario applies to Questions 3 and 4: A randomized experiment was done by randomly assigning each
participant either to walk for half an hour three times a week or to sit quietly reading a book
Sample Midterm 2 Multiple Choice Questions
This scenario applies to Questions 3 and 4: A randomized experiment was done by randomly assigning each
participant either to walk for half an hour three times a week or to sit quietly reading a book for half an
1) Suppose individuals with a certain gene have a 0.4 probability of
eventually contracting a particular disease. If 15 individuals with the
gene participate in a lifetime study, what is the distribution of the random
variable X describing the number of t
Sample Midterm 2 Free Response SOLUTIONS
1. In a study of acupuncture for treating pain, 100 volunteers were recruited. Half were
randomly assigned to receive acupuncture and the other half to receive a sham acupuncture
treatment. The patients were follow
Testing hypotheses about means
MOS5e chapter 13
Copyright Dr. Brigitte Baldi 2017
A random sample of 20 healthy adults eating a traditional American diet
is selected. They agree to adopt a vegetarian diet for 1 month. Based
on the findings, we are 95% co
Collecting data
MOS5e chapters 5 and 6
Copyright Dr. Brigitte Baldi 2017
Two sources of information
Sample
(data for some individuals)
Population
(data for all individuals)
! statistic
! parameter
population
sample
1
The role of randomness
How do you cho
Probability
MOS5e chapter 7 (and chapter 8 sections 1-2)
Copyright Dr. Brigitte Baldi 2017
Randomness and probability
Random event
uncertain outcome
Random variable
(make sure the outcome have
number(numerical values)
that we can use math.)
Probability o
Versnm lit
Stats 7 fall 2016 (Baldi) Midterm 2
g "x
Name: Student ID: cfw_-
Keep your exam to yourself and your eyes on your work. No electronic devices are allowed at any time, except for your
calculator. Cheating will be reported and result in a grade p
Stats 7 winter 2015 (Baldi) Final Solutions A/B
Problem 1 (5 points) < 10 min
A 2015 Pew Research Center survey of social media use in the United States found that 510 of a
random sample of 1134 American adult Facebook users said they are Facebook-friends
1)
(a) Gender
i. *Categorical
ii. Quantitative
(b) Age
i. Categorical
ii. *Quantitative
(c) Household income
i. Categorical
ii. *Quantitative
(d) Party voted for at last election
i. *Categorical
ii. Quantitative
2) What is the median of the following set
Sample Midterm 1 Free Response Questions
1. Eleven students were asked to measure their pulses for 30 seconds and multiply by two to get
their one-minute pulse rates. The results were:
32, 60, 62, 66, 70, 72, 74, 74, 78, 80, 84.
a. Create a five-number su
1) A political scientist takes a large sample of registered voters, and
measures a number of variables, as shown below. Are each of the variables
listed below categorical or quantitative?
(a) Gender
i. Categorical
ii. Quantitative
(b) Age
i. Categorical
i
Sample Midterm 1 Free Response Questions - SOLUTIONS
1. Eleven students were asked to measure their pulses for 30 seconds and multiply by two to get
their one-minute pulse rates. The results were:
32, 60, 62, 66, 70, 72, 74, 74, 78, 80, 84.
a. Create a fi
Chapter 8
Random
Variables
1
Midterm 1 next Tuesday
Check Course Information ModuleExam
Information for info on midterm topics and
practice free response and MC questions
Discussion Section on Friday will include
help preparing for the midterm.
I need
Chapter 7
Probability
Unregistered
iClicker: 84338631
Midterm 1 next Tuesday
Check Course Information ModuleExam
Information for info on midterm topics and
practice free response and multiple choice
questions
Discussion Section on Friday will include
he
Sample Final Multiple Choice Questions
1. The expected value of a random variable is the
a. value that has the highest probability of occurring.
b. mean value over an infinite number of observations of the variable.
c. largest value that will ever occur.
Sample Midterm 2 Free Response Questions: SOLUTIONS
PDF
1. Suppose that the amounts that students at a college spend on textbooks this semester have a
normal curve with mean = $360 and standard deviation = $120.
a. Draw a picture of this normal distributi
1) A mail-order company claims to ship 95% of its orders on time. 4000 orders were received
last week. You take a sample of 120 of these orders, and find that 108 were shipped on time.
What is the sample proportion of orders shipped on time?
(a) 3800
(b)