STATS 60, Spring 2008 April 2, Lecture 02
1
Freedman Chapters 3 & 4
Populations and samples A population is the universe of objects/subjects we are interested in. If we want to know the average age
Stats 60
Week 2 Extra Practice
1. If you havent done so already, look at the extra problems from Week 1. Many are still relevant
for this week.
2. The distribution of the weights of loaves of bread fr
Stats 60
Week 3 Extra Practice
1. The speed (miles per hour) and mileage (miles per gallon) of a certain car is shown below:
Speed 20 30 40 50 60
MPG 24 28 30 28 24
Sketch a scatterplot of these data.
SCCH on L3
gimomial D2547; c4
EX_ SAT Veradsl P4952156, 4+ M.C. Quay-hogs
/Q1 5- Angw chins
' a - I
WW) l(g)
lqm
0") [Pr (30 4ch 1 (5.5) :2
l. R w w u ,L
13" 5%*%[email protected]
' -R N w iXJx-xi.
3 -~ 5 5 5=(5
Statistics 60: Fall 2011 Section 4 (Oct 21) TA: Dennis Sun
Statistics 60: Section 4
1 The Counting Principle
0 Sample space: the set of all possible outcomes of a random phenomenon
0 Event: any part
Stats 60
Week 4 Extra Practice
1. At a high school, 25% of students are involved in theater, 40% are involved in athletics, and 55%
in at least one of the two. Is involvement in theater independent of
1c / I jam.
wl
. 3,.- ,.'
. Stats 60
Pf Week 1 Extra Practice
/" "
1. Suppose we measure the weight that ve Stanford footbali players can bench, and we record the
following observations (in'pounds): 2
Lecture 5.1.
0. QHW-5 on Coursework. Note that we are still working
our way through QHW-4.
0.1. Decision-making under uncertainty: Often we are
faced with a choice of actions, such that the consequenc
Psy 10/ Stat 60
Ewart Thomas
1
Notes on small vs large n, parametric vs non-parametric tests, t vs z tests, etc.
Ewart Thomas (Week 7)
It is helpful to review some of the issues, administrative as wel
Lecture 7.1.
0. QHW-7, etc. on Coursework.
Lecture Outline
0.1. 1- vs 2-tailed tests
0.2. The use of p-values instead of the reject/retain H0
approach
0.3. The size of the Rejection Region, R, is .
0.
Psy 10/Stat 60
Ewart Thomas
Lecture 4.1
0. QHW-4 but we still need QHW-3.
1. Review of formal tests
i) test statistic, 2; and recently z, with critical values 2.
ii) level of significance, mostly 0.05
Lecture 3.1
0.1. QHW-3 available on Coursework.
0.2. Review and Preview
0.2.1. Statistical inference for
(i) univariate distrns, using 2 with (k-1) df;
(ii) bivariate distrns, using 2 with (r-1)(c-1)
Stats 60
Week 1 Extra Practice
1. Suppose we measure the weight that five Stanford football players can bench, and we record the
following observations (in pounds): 280, 250, 355, 275, 290.
(a) What a
Stats 60
Week 5 Extra Practice
1. (Bayesian Spam Filtering) Given that a word appears in a e-mail, what is the probability that
it is spam? It is easy to find the probability that a word appears in a
Stats 60
Week 3 Extra Practice
1. The speed (miles per hour) and mileage (miles per gallon) of a certain car is shown below:
Speed
MPG
20
24
30
28
40
30
50
28
60
24
Sketch a scatterplot of these data.
STATS 60, Spring 2008 April 3, Lecture 03
1
More on box plots (and histograms)
Example 1
Consider the sample x = -2, -2, -1, -1, 0, 0, 0, 0, 1, 1, 1, 1, 2, which has 13 elements. To create a histog
STATS 60, Spring 2008 April 8, Lecture 05
1
Freedman Chapters 5 & 6
Normal curve The normal curve (normal probability density function, or normal pdf ) can be used to describe the distribution of a
STATS 60, Spring 2008 April 9, Lecture 06
1
Freedman Chapters 7 & 8
Slope and intercept
Soon we will begin our discussion on regression, and in regression we will want to draw a straight line throu
STATS 60, Spring 2008 April 14, Lecture 08
1
Freedman Chapters 9, 10, 11 & 12
A note on interpolation
When discussing percentiles, we said, for example, that the 0.25(n + 1)th element in an ordered
Statistics 60
Introduction to Statistical Methods
Assignment #4
Due Tuesday April 19, 2011
Prof. J. Taylor
You may discuss homework problems with other students, but
you have to prepare the written as
Statistics 60
Introduction to Statistical Methods
Practice Quiz #3
Prof. J. Taylor
The quiz will be closed book. You must show your work for
full credit.
You will have to circle your section leader:
Statistics 60
Introduction to Statistical Methods
Assignment #1
Due Friday April 01, 2011
Prof. J. Taylor
You may discuss homework problems with other students, but
you have to prepare the written ass
Statistics 60
Introduction to Statistical Methods
Practice Quiz #2
Prof. J. Taylor
The quiz will be closed book. You must show your work for
full credit.
You will have to circle your section leader:
Statistics 60
Introduction to Statistical Methods
Assignment #2
Due Friday April 08, 2011
Prof. J. Taylor
You may discuss homework problems with other students, but
you have to prepare the written ass
Stats 60
Week 4 Extra Practice
1. At a high school, 25% of students are involved in theater, 40% are involved in athletics, and 55%
in at least one of the two. Is involvement in theater independent of
1
Psych 10/Stat 60
Ewart Thomas
Lecture 2.1
0.1. Week 2 folder now open on Coursework
0.2. Quiz 1 tomorrow 8:50-9:50 in Annenberg and Cemex.
The graded blue-books will be placed in the slots outside R