Statistics 103: Midterm 1
Test Form A
(Dated: January 27, 2016)
Instructions: Before you do anything, make sure your name, ID and your test form type is on
your scantron. You have until 11:50am to finish this test. You may use one sheet of notes and a
cal
Statistics 103: Lab 1
LAB PROBLEMS
Find the total taxes paid by this family per year.
answer: $ 9540
1. Suppose that the tax ti paid by individual i is the
following function of his or her income xi :
ti = 0.1(xi 2000)
2. If last weeks average temperature
Statistics 103 - Fall 2011
Term Project
Report due dates:
October 25 - interim report due
November 28 - nal report due, no extensions
The project has two deadlines, an interim report and the nal report. The
interim report should be a brief one or two page
Statistics 103, Spring 2015, Practice Midterm III Solution
answer: a
Part One: Multiple Choice
5. True or false: Let X1,.,Xn be a
simple random sample from a
normal population, then X also
follows a normal distribution
exactly no matter what sample
size n
Statistics 103 Fall 2013
Sample Midterm
PROBLEM 1
Let A and B be events such that P (A) = .5 and P (B ) = .4
(a) If P (A B ) = .7 then what is P (A B )
(b) Are A and B independent in part (a) above? Why or why not?
(c) Suppose P (A B )=.3. Are A and B ind
True/False
For each of the following questions indicate true or false, then explain your choice. You
may also use examples to explain your choice.
I. If two events are independent, they cannot both happen at once.
II. For a discrete random variable X whic
Discussion 1
Statistics 103
Winter quarter 2016
Instructions
3. (Level 2) Let W be a random random variable with PMF
given by:
Hi Everyone. Here are the discussion/lab problems. The TAs
will go over the solutions in detail during the discussion section
(a
Statistics 103: Midterm 3
Test Form B
(Dated: March 2, 2016)
Instructions: Before you do anything, make sure your name, ID and your test form type is on
your scantron. You have until 11:50am to finish this test. You may use one sheet of notes and a
calcul
Statistics 103 Homework 1
Due: Wednesday October 12, 2011
(P1) Problems 2.1 and 2.2 on page 11
(P2) Problems 2.3-2.5 on page 17
(P3) Problem 2.6 on page 17
(P4) Problem 3.1 on page 24
(P5) Problem 3.5 on page 33
(P6) Problem 3.11 on page 33
(P7) Problem 3
(a) Find the value of c such that p(x) is a valid probability density function.
STA 103 Winter 2015
Homework 3 - Due January 28th
1. A student oered random people 5 cookies total. Let X
be the number of cookies that the person took, and let
X have the fol
STA 103 Winter 2015
Homework 2 - Solutions
1. Notice that Y = 40000 + 0.60X 6000 = 34000 + 0.60X
(a) Y = 34000 + 0.60X = 34000 + 0.60 125000 = 109000
(b) Y = |0.60|X = 0.60 30000 = 18000. The typical deviation of student salary from the mean of $125,000 i
STA 103 Winter 2015
Homework 8 - Due Monday, March 16th
1. An accounting rm is trying to decide between IT training conducted in-house and the use of third party consultants. Each type of training was implemented at two
of the rms oces. The average cost f
Notes
STA 103:
Applied Statistics for Business &
Economics
Lecture 1
Paul Baines
Department of Statistics
University of California, Davis
September 28th, 2012
Course Introduction
Notes
Syllabus on the course website.
Basic course goals:
(1) To develop a s
STA 103 Winter 2015
Homework 2 - Due January 21st
1. A graduate student believes that his starting salary will
be based on his thesis professors salary, in the form of
the equation
Y = 40000 + 0.60(X 10000)
where Yi is the students average salary and X is
Statistics 103: Midterm 1
Test Form D
(Dated: January 27, 2016)
Instructions: Before you do anything, make sure your name, ID and your test form type is on
your scantron. You have until 11:50am to finish this test. You may use one sheet of notes and a
cal
Statistics 103, Spring 2015, Practice Final
answer: c
Instructions:
2.
The exam is closed
book and closed notes,
but you can have two
pages (8.5 by 11,
doublesided)
of
handwritten notes of
your own. Submit your
notes (with your name
on it) along with
the
Statistics 103 - Fall 2013
Term Project
Report due dates:
November 8 - interim report due
December 6 - nal report due, no extensions
The term project requires you to read a paper:Comparing and selecting performance measures using rank correlations by Mass
STA 103 Winter 2015
Homework 1 - Due January 14th
4. In a population of 20 families, the number of cars owned
by each family is given below:
0, 2, 2, 3, 1, 1, 4, 2, 4, 5, 1, 3, 6, 1, 2, 4, 3, 2, 3, 3
1. Consider the following list of Xi , Yi values:
Xi
1
Statistics 103 - Fall 2015
Term Project
Report due dates:
November 6 - interim report due
December 4 - nal report due, no extensions
The term project requires you to read a paper:Comparing and selecting performance measures using rank correlations by Mass
2
2
2
3 = X1 + X2 + X3
5
5
5
STA 103 Winter 2015
Homework 7 - Due Wednesday, March 11th
1. The mean and standard deviation of the amount customers spend in a high end clothing store is $600 and
$150 respectively. Assume the amount of money customers spend
STA 103 Winter 2015
Homework 4 - Due February 11th
1. Suppose the length of time students take in writing a
standard entrance examination is normally distributed
with mean 60 minutes, std. deviation 8 minutes.
(a) Find the probability that a randomly sele
STA 103 Winter 2015
Homework 5 - Due February 18th
1. A firm has monitored the duration of long-distance telephone calls placed by its employees to help it decide
which lonng-distance package to purchase. The duration
of calls was found to be exponentiall
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STA 103 Homework 6 Due Dec 3
https:/www.coursehero.com/file/12027129/HW-6/
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STA 103 HW 6 Solutions
https:/www.coursehero.c
2
2
2
3 = X1 + X2 + X3
5
5
5
STA 103 Winter 2015
Homework 7 - Due Wednesday, March 11th
1. The mean and standard deviation of the amount customers spend in a high end clothing store is $600 and
$150 respectively. Assume the amount of money customers spend
Bivariate Distributions
Def: A joint distribution of two random variables X
and Y is called a bivariate distribution.
1
P (X = x, Y = y) = p(x, y)
is the probability that X = x and Y = y
2
I
J
p(xi, yj ) = 1
i=1 j=1
The means for X and Y are
I
J
3
X =
x
The Bureau o'f' Labor Statistics refo/tevl
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