Stat 105/Sanchez
Quiz 2
x/10
ID_
NAME_
1. The angle at which electrons are emitted in muon decay has a distribution with
density
f (x | ) =
1 + x
2
1 x 1
1 1
where x =cos . The parameter is related to
STATS 105 Homework 5 (due Thursday 5/10/12 in Discussion)
Exercises 9-20, 9-23, 9-24, 9-26, 9-42, 9-47, 9-48, 9-50, 9-72.
9-20. A manufacturer is interested in the output voltage of a power supply use
Stat 105-Practice Midterm 2
The same rules apply to this exam as in midterm 1 (closed book, closed notes; no graphic
calculators, no phones, pen or pencil). The cheat sheet can be two-sided this time,
STATS 105 Homework 5 (due Wednesday 2/18/09 in class)
Exercises 9-4, 9-10, 9-14, 9-26, 9-36, 9-38, 9-52 (data online).
9-4. The mean pull-off force of a connector depends on cure time.
a. State the nu
Probability
Last time
P(A and B)
P(A or B)
P(A | B)
According to the data in this sample:
If the person is a female, the
probability she is left-handed is
*
A. 226/332
Clicker question
B. 29/226
C.
Daniela Hernani
Lab 3
Stats 10
1. The percentage of Kobe Bryant's attempted baskets that are successful is 58 out of 133,
or about 43.6%
2. Kobe Bryant's typical streak length, measured by the median,
Daniela Hernani
LAB 2
Stats 10
1. The number of at at-bats somewhat helps predict the number of runs a team will score. It
can help us predict the number of runs based on a knowing a teams at-bats. Th
Homework 3 Solution
8-6
a) Sample mean from the first confidence interval =37.53 + (49.87-37.53)/2 = 43.7
Sample mean from the second confidence interval =35.59 + (51
Homework 5 solutions
9-117
1) Interest is on the distribution of statistics and OR grades.
2) H0: Statistics grades are independent of OR grades.
3) H1: Statisti
4-6 Normal Distribution
5-5 Linear Combinations of Random Variables
1-1 The Engineering Method and
Statistical Thinking
Figure 1.1 The engineering method
1-1 The Engineering Method and
Statistical Thi
Means and Proportions
Two-proportions
So far, our hypothesis have compared a
sample proportion to a hypothesized
population value.
But more often, we wish to compare two
proportions to see if they a
Regression
Analyzing associations between two numerical variables
Evan Ziporyn, from Bang On a Can Allstars, says this about
In C:
The piece is always recognizably itself, and yet no two
performances
Inference with one or
two means
Outline
One mean, using computer
Hypothesis test and CI
Two means
How were data collected? Paired or
unpaired?
Review from last week
Carl Reinhold August Wunderlich
Hypothesis Testing
Lecture 7.1
purpose
Confidence intervals answer the question
how much? or What percent?
Hypothesis tests answer a different type of
question: is the percentage different from
what
http:/onlinestatbook.com/stat_sim/
sampling_dist/index.html
If sample is random and
independent
Sample mean is unbiased estimator of population mean.
Sample mean is a "precise" estimator, meaning tha
Survey Sampling
Framework
We wish to estimate the proportion of all
people or objects in a population with a
certain characteristic. Call this proportion
p.
If we can survey everyone in the populati
Inference for Means
motivating example
What would you say is a healthy body
temperature (in Fahrenheit)?
98.6 degrees F.
This figure comes from data collected in.
the 1840s
Carl Reinhold August Wu
Numerical Summaries
Does political affiliation
vary with gender in our
class?
What's gender
distribution in class?
about 68% female
What's political
distribution?
If gender and political affiliation a
Example questions
The distribution of womens heights follows a
normal model with mean 64 inches and
standard deviation 3 inches. What percent of
women are.
A) taller than 65 inches
B) Between 60 and
On midterm
Interpreting intercept and slope WILL be
covered (modestly) on the midterm.
expect one or two multiple choice
questions checking to see if you can
determine which interpretation is valid.
Welcome to Stats 10
Tyson Roberts
Fall, 2015
Today
Classroom logistics
Introduction to Data
Course information
http:/ccle.ucla.edu
Tyson Roberts: MS 8145
[email protected]
Office Hours: M 1
Paired and Independent Samples
A study to test the effectiveness of diet: researchers
randomly assigned 168 overweight people to one of four
diets: Atkins, Weight Watchers, Ornish, The Zone
Weight was
Outline
What's a distribution of a variable in a
sample?
Pictures of distributions: center, spread,
shape.
Numerical summaries of distributions:
center & spread.
Distribution
One of the fundamenta
Numerical Summaries
measuring center &
spread
If the distribution is symmetric
the mean is a good measure of center
the standard deviation measures
variability
measuring center and
spread
But if t
Does a stradivarius violin sound better
than a modern violin? (NY Times, 1/2/12:
only in people's minds.)
Can listening to music relieve pain?
Is the earth's climate growing warmer? Is
human activi
Cramer-Rao Inequality
Fisher Information
7-1 Introduction
The field of statistical inference consists of those
methods used to make decisions or to draw
conclusions about a population.
These methods