ph 142
KEY
problem set 7
15 points
Part 1. hypothesis test about a mean
9 points
Vitamin C loss in wheat soy blend
These are the same data as we used in problem set 6 to calculate a confidence interval.
The assumptions for using t distributions for hypoth
ph 142
preparing for quiz 2
The quiz is in section on Friday February 26
What does the quiz cover?
normal probability distributions N(,)
know that every distribution in the normal family of distributions
is completely characterized by 2 parameters:
1. the
ph 142 Workshop Problems partial key
probability and random variables
Part 1.
Suppose the probability of the school of public health softball team winning an intramural game is
.40, no matter which team they are playing, and that their game results are in
ph 142
problem set 4
10 points
random variables
winnings at heads and tails
Jos and Juanita are playing a coin-tossing game.
They toss 4 fair coins. P( head ) = 1 / 2 and P( tail ) = 1 / 2 for every toss.
The coins are independent.
Jos wins a dollar from
ph 142
probability and statistics in biology and public health
spring 2016
descriptive statistics
probability
sampling distributions
confidence intervals and tests for means and proportions
comparing the means of 2 populations and proportions from 2 popul
For problems about means,
the questions on problem set 5 about the lengths of human pregnancies say that
the dist of the pregnancy lengths (the X values) is approx normal, so your answer to
question (b)
should say, quoting reader page 14), that sampling d
KATHERINE SHAM 26109338
ph 142
problem set 2
10 points
We have edited the problems from the text for clarity and to bring them closer to language
were using in lecture.
Please show intermediate steps and briefly explain your logic.
Part 1. based on Baldi
IPA Practice
LING 100, Fall 2017
1. Find the errors
Find the errors in the transcriptions of the consonant sounds in the following words. In each
word, there is one error, indicating an impossible pronunciation of that word for a native
speaker of English
ph 142
problem set 2
partial key
10 points
We have edited the problems from the text for clarity and to bring them closer to language
were using in lecture.
Please show intermediate steps and briefly explain your logic.
Part 1. based on Baldi and Moore ex
NAME: _
STUDENT ID:_
PH 126 Spring 2017
Problem Set # 2
Grade: /38 pts
This problem set must be handed in at the beginning of lecture on Thursday, March 9th by
11:10am. Remember to show your work and label all a
ph 142
problem set 1
10 points
This problem set provides you with aIl the Stata output you need.
(The data are available in a Stata dataset in bCourses called calltimes.dta if you are interested in
exploring them further, but you dont need to do that to c
ph 142
problem set 5
10 points
adapted from Baldi and Moore chapter 13 (these questions are different from the text)
13.36 pregnancy lengths
5 points
The lengths of human pregnancies from conception to birth varies according to a distribution:
that is app
ph 142
quiz 2
fall 2016
for practice for the final
You may use the salmon summary handout from class.
You will need a simple scientific calculator. You may not use a cell phone calculator.
A copy of the t table from Baldi and Moore is available.
Show all
ph 142
fall 2016
quiz 4
for practicing for the final
2
You may use the buff-colored two-sample summary sheet and the blue test summary .
You will need a simple scientific calculator. You may not use a cell phone calculator.
Show all work on these sheets.
ph 142
KEY
problem set 7
15 points
Part 1. hypothesis test about a mean
9 points
Vitamin C loss in wheat soy blend
These are the same data as we used in problem set 6 to calculate a confidence interval.
The assumptions for using t distributions for hypoth
ph 142
practice problems for hypothesis tests one sample problems
for a population mean
In these problems, we don't have the raw data.
Look at the sample size and the information given to be sure it's reasonable to use the t
distribution for confidence in
ph 142
section activities Wednesday Apr 26 and Thursday Apr 27
A study was carried out to explore the relationship between drivers ages and the maximum
distance away at which they could read road signs. (Call this "legibility distance.")
Assume that the d
two-sample practice problems for means
adapted from Baldi and Moore
exercise 18.28
page 458
testosterone and obesity in adolescent males
Obesity in adult males is associated with lower levels of sex hormone. Example 17.2 described a study
investigating a
ph 142
section activities Wednesday Apr 26 and Thursday Apr 27
partial key
A study was carried out to explore the relationship between drivers ages and the maximum
distance away at which they could read road signs. (Call this "legibility distance.")
Assum
ph 142
practice problems for hypothesis tests one sample problems
partial solutions
for a population mean
In these problems, we don't have the raw data.
Look at the sample size and the information given to be sure it's reasonable to use the t
distribution
two-sample practice problems for ph 142 final
partial key
adapted from Baldi and Moore
exercise 18.28
page 458
testosterone and obesity in adolescent males
Obesity in adult males is associated with lower levels of sex hormone. Example 17.2 described a stu
ph 142
fall 2016
quiz 3
for practice for the final
You may use the salmon summary handout.
You will need a simple scientific calculator. You may not use a cell phone calculator.
Show all work on these sheets; you may use the backs of the pages as needed.
ph 142
preparation for midterm
what you may bring, and what you will need:
You may bring one 8 by 11 sheet with notes and formulas (both sides of course!)
and the green probability summary sheet.
A copy of the normal curve from Bldi and Moore will be atta
LING 100, Fall 2017
Homework 5 due 12pm (noon), October 6, 2017
Reminder: Type up your answers in a word processor, save them as a pdf, and upload them to bCourses
under the HW5 assignment module. You must submit a complete homework assignment or you will
University of California, Berkeley
School of Public Health
On-Campus/Online Professional MPH Degree Program
PH W142: INTRODUCTION TO PROBABILITY AND STATISTICS
Fall 2011
Instructor: Maureen Lahiff, PhD
307 Haviland Hall, [email protected]
Course format:
ph 142
problem set 6
15 points
Please prepare your problem set submission on a separate sheet of paper, not on this sheet.
You may download and work with this document, inserting your graphs for questions 3 and 4 of part
1 in the appropriate places. You m
ph 142 Workshop Problems
two-sample problems
brief answer key
I. FEV
difference in averages
.3595
est std error of difference
0.1638
test statistic
2.19
34 df
P value for two-tailed alt hyp 0.035
II. binge drinking
estimated proportions
men
.227
women .
ph 142 Workshop Problems
more hypothesis tests
brief answer key
I. tests for proportions
13. "sometimes I copy information from the internet into my papers without reporting the
source."
under the null hypothesis, the standard error for the sample proport
ph 142
2
Workshop Problems
This week features both 2
2
tests for association and a
tests
goodness of fit test .
Part I.
A research organization, interested in testing whether the proportions of sons taking up the
occupations of their fathers are equal fo
ph 142
section activities for Wednesday Sept 6 and Thursday Sept 7
partial key
4.111 and 4.112 Exercise and sleep. Suppose that 40 % of adults get enough sleep, 46 % get
enough exercise, and 24 % do both.
enough exercise
enough sleep
and enough exercise
e
ph 142
section activities for Wednesday Sept 13 and Thursday Sept 14
partial key
reasoning with combinations
1. A bag of 10 apples contains 2 rotten ones.
If you select 6 apples to pack for a picnic, what is the probability that all of them are good?
8
6