Q SCI 381
Dr.Bare
Name:_
Hourly Examination Three Answers
1.a. Use the z-distribution to find the z-values corresponding to the two
given x-values. You should find that 82 bushels corresponds to a z-value
of -1.75 and 138 bushels corresponds to z = 1.75.

Test Four
Q SCI 381
Name:
Dr. Bare
_
Hourly Examination Four
Closed book. May use calculator and formula card (sheets). Show all work for full
credit. This means show which text book formula is used; plug in a few
representative data points to demonstrate

QSCI 381: Introduction to Probability and Statistics
Winter, 2015
Course Summary
Course Website: https:/canvas.uw.edu/courses/950210
Instructor: Stephen Scherba, Jr.
Email: scherba@uw.edu
Office: Anderson 006A
Office Hours: T, Th 4:30 - 5:30, W 1:30 - 3:3

Test One
Q SCI 381
Dr. Bare
Name:_
Hourly Examination One
Closed book. May use calculator and formula card (sheets). Show all work for full
credit. This means show which text book formula is used; plug in a few
representative data points to demonstrate th

Test Two
Q SCI 381
Dr. Bare
Name:_
Hourly Examination Two
Closed book. May use calculator and formula card (sheets). Show all work for full
credit. This means show which text book formula is used; plug in a few
representative data points to demonstrate th

Yilei Wang
QSci 381: Introduction to Probability and Statistics
Spring 2016
Homework #6
Due Thursday May 26 by 2:30pm
74 points
Page 426. # 20, 24
Page 433. #16, 18
Page 434. #20. Instead of assuming the variances are not equal, test to see if they are th

Name: Yilei Wang
University of Washington
College of the Environment
QSCI 381: Introduction to Probability and Statistics
Summer 2016
Lab 2 Assignment
Due: Friday, July 22, 2016
1 (15 points). A microbiologist studying plants knows that cross-fertilizing

Yilei Wang
QSci 381: Introduction to Probability and Statistics
Spring 2016
Homework #5
Due Thursday May 19 by 2:30pm
64 points total
Page 359. #6, 8, 10
Page 360. #26, 30, 32, 38
Page 361. #52
Page 373. #10, 14
Page 374. #20, 24 (you do not need to inclu

Name: Yilei Wang
University of Washington
College of the Environment
QSCI 381: Introduction to Probability and Statistics
Summer 2016
Lab 3 Assignment
Due: Friday, August 5, 2016
1. (25 points) These data on housefly wing lengths provide an excellent exam

Name: Yilei Wang
University of Washington
College of the Environment
QSCI 381: Introduction to Probability and Statistics
Summer 2016
Lab 4 Assignment
Due: Friday, August 19, 2016
1. (20 points) Import the data on housefly wing length. These data on house

QSCI 381: Introduction to probability and Statistics
Homework and Lab Assignments
Self Assessment Test (Due Wednesday 1/7/15) (Turning it in is worth an easy 5 points)
Course Survey (Due 1/7/15)
From the Course Website, read the following (Due (1/7/5):
Hu

QSCI 381: Introduction to probability and Statistics
Homework and Lab Assignments
Self Assessment Test (Due Wednesday 1/7/15) (Turning it in is worth an easy 5 points)
Course Survey (Due 1/7/15)
From the Course Website, read the following (Due (1/7/5):
Hu

QSCI 381: Introduction to Probability and Statistics
S. Scherba, Jr.
Introduction to Statistics (Chapter 1):
Its easy to lie with statistics. But is it easier to lie without them.
Frederick Mosteller (American statistician, 1916 2006)
What is statistics

QSCI 381: Introduction to Probability and Statistics
S. Scherba, Jr.
Data (Chapter 2):
Data:
Are the observed values of variables.
Are not just numbers.
ALWAYS come with a context
Do not exist independently of people.
People collect data. They choose:
Wha

Q SCI 381 Prof. Steve Scherba, Jr.
Winter, 201 5
PRACTICE
EXAM #1
NAME:
- Put your name, exam number, and date on your blue (green) book
0 Place all answers in your blue (green) book CLEARLY numbering each question
answered.
0 Show ALL OF your work CLEA

University of Washington
College of the Environment
QSCI 381: Introduction to Probability and Statistics
Summer 2016
Lab 1 Assignment
Due: Friday, July 8, 2016
Note: Attach your R script to your lab assignment for full credit (see question 11). Copy and
p

Yilei Wang
Q Sci 381
#46: 5! = 5 x 4 x 3 x2 x1 = 120
#49: (13,1)(4,3) x (12,1)(4,2) /(52,5) = 3744/2598960 = 0.0014
#50: There are three letters 1 digit. The first letter has 23 options; the second letter has
26 options; the third letter has 26 options. T

Test Three
Q SCI 381
Name:
Dr. Bare
_
Hourly Examination Three
Closed book. May use calculator and formula card (sheets). Show all work for full
credit. This means show which text book formula is used; plug in a few
representative data points to demonstra

Test Three
Q SCI 381
Name:
Dr. Bare
_
Hourly Examination Three
Closed book. May use calculator and formula card (sheets). Show all work for full
credit. This means show which text book formula is used; plug in a few
representative data points to demonstra

Q SCI 381
Dr.Bare
Name:_
Hourly Examination Four Answers
1. Ho: u >=32 Ha: u < 32 (claim)
1.b. z = (31.7 -32)/(.7/7) = -3.00
1.c. zo = -2.33
1.d. reject Ho
1.e. At the alpha = .01 level there is sufficient
evidence to reject the null hypothesis and theref

Q SCI 381
Dr.Bare
Name:_
Hourly Examination Four Answers
1. Ho: u >=32 Ha: u < 32 (claim)
1.b. z = (31.7 -32)/(.7/7) = -3.00
1.c. zo = -2.33
1.d. reject Ho
1.e. At the alpha = .01 level there is sufficient
evidence to reject the null hypothesis and theref

Test Four
Q SCI 381
Name:
Dr. Bare
_
Hourly Examination Four
Closed book. May use calculator and formula card (sheets). Show all work for full
credit. This means show which text book formula is used; plug in a few
representative data points to demonstrate

Test Five
Q SCI 381
Name:
Dr. Bare
_
Practice Hourly Examination Five
Closed book. May use calculator and formula card (sheets). Show all work for full
credit. This means show which text book formula is used; plug in a few
representative data points to de

Test Five
Q SCI 381
Name:
Dr. Bare
_
Practice Hourly Examination Five
Closed book. May use calculator and formula card (sheets). Show all work for full
credit. This means show which text book formula is used; plug in a few
representative data points to de

Q SCI 381
Dr.Bare
Name:_
Final Examination Answers
1.a. Ho: u >= 145 lbs. Ha: u < 145 lbs. (claim)
1.b. t = -4.4
1.c. to = -2.492 with df =24 and alpha = .01
1.d. Reject the Ho.
1.e. At the 1% level of significance there is sufficient evidence to
conclude