STA 32  Spring 2015  R Homework 1  Due Friday, April 10th
An introduction statistics course from a Washington university was polled, and their gender, and their
college GPA, their number of siblings, and their highschool GPA was recorded in LargeIntro.
STA 032 Spring 2015
Homework 3  Solutions
1. (a) The c.d.f can be found below:
X
F (x)
1
0.60
2
0.80
3
0.95
4
0.98
5
1
(b) At least one commuter means
P (X 1) = 1 P (X < 1) = 1 P (X = 0) = 1 0 = 1.
(c) Between 2 and 4 inclusive means
P (2 X 4) = P (X = 2
STA 032 Spring 2015
Homework 7  Solutions
1. Notice that since the sample size is large, we can use Z/2 . Let population 1 be third party consultants, population 2
be inhouse training.
2
2
s
s
482
(a) (X Y ) Z/2 nX + nY (500 490) 1.96 180 +
X
Y
So tha
STA 032 Spring 2015
Homework 2  Due Wednesday, April 15th
1. A section of an exam contains four TrueFalse questions.
A completed exam paper is selected at random, and
the four answers are recorded. Assume all answers are
equally likely to be chosen (a v
STA 032 Spring 2015
Homework 3  Due Wednesday, April 22nd
1. A sociologist uses the following p.m.f to represent X =
number of commuters in a car: Use this data to complete
X
p(X)
1
0.60
2
0.20
3
0.15
4
0.03
5
0.02
the following:
(a) Write down the cumul
STA 032 Spring 2015
Homework 6, due May 20th
1. Oven thermostats were tested by setting them to 350
degrees F and measuring the actual temperature of the
oven. In a sample of 67 thermostats, the average temperature was 348.2 degrees F and the standard dev
STA 032 Spring 2015
Homework 4, due May 13th
1. Assume weights of cats of a certain breed are normally
distributed with mean 4.1kg and standard deviation
0.6kg. Assume all cats weights are independent.
5. In a particular state, a major ood happens once ev
STA 032 Spring 2015
Homework 4, due May 6th
1. Suppose that the probability of getting an A in a particular course is 0.08, and assume that the all student grades
are independent. If you randomly sample 20 students
taking the course;
(a) Find the expected
STA 032 Spring 2015
Homework 1  Due Wednesday, April 8th
1. Answer the following questions as True or False (it is very
good practice to explain your answers):
(a) For any list of numbers, half of them will be below
the mean.
(b) The sample mean is alway
STA 032 Spring 2015
Homework 7, due June 3rd
1. An accounting rm is trying to decide between IT training conducted inhouse and the use of third party consultants. Each type of training was implemented at two
of the rms oces. The average cost for a random
STA 32  Spring 2015  R Homework 2  Due Friday, April 177th
Problem 1
For this problem, we will be working with data on house sales in Solano county from 2003  2006. To load
the data, go to (in Rstudio) File, Open File, and choose housing.solano.Rda. T
STA 032  Spring 2015  R Homework 3  Due Friday, April 24th
Problem 1
Approximately 51% of the population is male (denoted M ), and 49% is female (denoted F ). Assume that
if someone is male, the probability they need to correct their vision is 0.60, an
STA 032  Spring 2015  R Homework 4  Due Friday, May 8th
Please look at R handout 4, on Smartsite/Piazza for useful tips and examples.
Problem 1
The goal of this problem is to simulate a Geometric random variable. Assume that on any given day, you
have
STA 032  Spring 2015  R Homework 5  Due Friday, May 15th
Please look at R handout 5 for hints.
Hints from lecture notes
Recall from lecture that the Central Limit Theorem (CLT) can be used with the binomial
distribution, so long as there are 10 success
STA 032 Spring 2015
Homework 3  Due Wednesday, April 22nd
1. A sociologist uses the following p.m.f to represent X =
number of commuters in a car: Use this data to complete
X
p(X)
1
0.60
2
0.20
3
0.15
4
0.03
5
0.02
the following:
(a) Write down the cumul
STA 032 Spring 2015
Homework 1  Due Wednesday, April 8th
1. Answer the following questions as True or False (it is very
good practice to explain your answers):
(a) For any list of numbers, half of them will be below
the mean.
(b) The sample mean is alway
STA 032 Spring 2015
Homework 4  Solutions
1. Let X be the number of students who got an A. Then, X is binomial with n = 20, p = 0.08.
(a) X = np = 20 0.08 = 1.6, np(1 p) = 20 0.08 0.92 = 1.21326
20
0
(b) P (X = 0) =
0.080 0.9220 = 0.1887
(c) P (X 2) = P

title: "Bootstrap Example"
author: "Erin Melcon"
date: "Monday, February 23, 2015"
output: html_document

Recall that for a nonparametric bootstrap, we are interested in estimating a value $\theta$.
A nonparametric bootstrap has the following steps:
STA 32 Extra Credit
due Thursday, March 19 at the Final Exam
All work is to be completed individually. You are not allowed to discuss the questions
with anyone other than the instructor or TA. Any outside help beyond that is considered
plagiarism. You are
STA 32 Take Home Project, due
Thursday, March 19 at the Final Exam
All work is to be completed individually. You are not allowed to discuss the questions
with anyone other than the instructor or TA. Any outside help beyond that is considered
plagiarism. Y
Full Detail
Work out the following problems. Show your work.
1. An economist would like to determine if housing costs have signicantly changed over the past 5 years. 5
years ago, he took a random sample of houses and calculated summary statistics of the p
STA 032 Homework 4
Due Wednesday, Feb 11th
Section 4.1
Section 4.3
Section 4.2
Section 4.4
4.2.20 continued on next page
STA 32 Homework 4 Solutions
Section 4.1
Section 4.2
Section 4.3
Section 4.4
STA 32 Winter 2015 Homework 5
Section 4.7
Due February 18th
Section 4.5
Section 4.8 (Uniform Distribution)
Note, not all parts of 4.5.20 are assigned.
STA 32 Winter 2015 HW 5 Solutions
Section 4.5
Section 4.7
Section 4.8 (Uniform Distribution)
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