STAT 20 HW 1 Q7: An introduction to continuous random variables.
The Prelude:
When dealing with a variable like the number of children who live in 60 houses on a street or
the number of cars parked at each of the 60 houses we deal with counts that have po
Assignment 19
page 286
9.) Choice ii (B gives a better chance of winning). In B 200 draws are made from the
box, and with a greater number of draws, the percentage of red drawn is more likely
to be close to the amount in the box. Since you have more red i
Statistics Notes:
Chapter 1: Controlled Experiments
I.
II.
Vocab
a. Method of Comparison: Statisticians like to use this method because it
allows them to compare two groups and see the results
b. Treatment Group: The group that receives the treatment (X)
Assignment 6
Pg. 94
#3a.) Approximately 25%
3b.) Approximately 10%
Pg. 95
#7a.) 95th percentile. 1 standard deviation away would be 100, but they were more
than that and falling in 2 standard deviations away puts you in the 90th percentile
range
#7b.) Bet
Answers to Review Exercises
Part I. Design of Experiments
Chapter 2. Observational Studies
1. (a) Too hasty. What about population size?
Comments: Michigan may include the big bad city, but Minnesota has
twice the population of Michigan. The crime rate is
Summary Statistics, Ch 4-5
average (or mean) = sum of entries / number of entries
SD = rms of deviations from average
SU = (value - average)/SD
Correlation and Regression, Ch 8-12
r = average of (x in SU)(y in SU)
prediction error = actual value
- predict
Hank Ibser Statistics 20 Spring 2016
The final will be Tuesday, May 10, B-llam, in TWO rooms: Wheeler Auditorium
and 100 Lewis. Minh Nguyen's and Amy Bray's students in 100 Lewis, everyone
else in Wheeler. Please plan to arrive a bit early so we can start
Chapter 5 Final Review
Sampling to study a part (sample) to gain information about an entire group (a population)
Simple Random Sample (SRS) individuals given equal chance to be chosen, unbiased results
Choosing an SRS: assign a # to each individual use T
Define a parameter
A number that describes a
population, unknown
Define a statistic
Computed from sample data,
used to estimate any unknown
parameters
What does p-hat represent?
The sample proportion of a
statistic
What is the sampling
distribution of a s
What is included in a 2-way
table?
What would be the null and
alternative hypothesis for a test
of significance that involves a 2way table?
What is a chi-squared statistic?
Expected, and Observed Counts
Null: there is no difference
between the observed an
What distinguishes a
t-distribution?
What are the conditions for a
t-distribution?
Is the t-distribution (itself) a
normal distribution?
How do you find the degrees of
freedom for a t-distribution?
What is the formula for a onesample statistic?
Is a t-dis
Assignment 5
Pg. 65
#5.) Average Age: The majority of students would fall under a certain age bracket,
but it would still have a right tail because there would be some outliers who are
extremely old; ex: Maybe students who had kids, and then returned back
Assignment 8
Pg. 132
4a.) Yes, it is on the SD line; 2 Standard Deviations above average weight & 2
Standard Deviations above average weight
pg. 134
#1a.)
Average X = 28/7 = 4
Average Y = 4
SDx = 1-4 = -3
2-4=-2
3-4=-1
4-4=0
5-4=1
6-4=2
7-4=3
SDx = Square
STAT 20: Spring 2011 Solution to Homework # 1 (Q1-Q6: 20 marks totai}
Note: When the marks for Q7 are added you may end up with a total over 24.
This will later count as a bonus.
Q2. Text P24 Q2. (3 marks total, 1 for each part).
a) You need to conside
STAT 20: Lecture Section 2. Spring 2011 Homework #2
Hand in HW to your GSI at the START of Section on Thursday Feb 24th.
Make sure to put your name, SID, section number, your GSIs name and
section time on the first page. Please staple all the pages togeth
STAT 20: Lecture Section 2. Spring 2011 Homework #3
Hand in HW to your GSI at the START of Section on Thursday March 10th.
Make sure to put your name, SID, section number, your GSIs name and
section time on the first page. Please staple all the pages toge
STAT 20: Lecture Section 2. Spring 2011
Solution to Homework #3
(26 marks total)
Q1. Text Page 153 Q2 (2 marks: 1 for each part a and b. Must have a reason. No
marks for saying "True/False" without an explanation)
a. False. Since the scatter diagram slope
STAT 20: Lecture Section 2. Spring 2011 Homework #4
Hand in HW to your GSI at the START of Section on Thursday March 31st.
Make sure to put your name, SID, section number, your GSIs name and
section time on the first page. Please staple all the pages toge
STAT 2: Lecture Section 2. Spring 2011 Homework #5
Hand in HW to your GSI at the START of Section on Thursday April 14th.
Make sure to put your name, SID, section number, your GSIs name and
section time on the first page. Please staple all the pages toget
STAT 20: Lecture Section 2. Spring 2011 Homework #6
Hand in HW to your GSI at the START of Section on Tuesday April 26th.
Make sure to put your name, SID, section number, your GSIs name and
section time on the first page. Please staple all the pages toget
ON SOME ASPECTS OF MEASUREMENT ERRORS
IN SAMPLE SURVEY
PRASENJIT PAL
M.Sc. (Agricultural Statistics), Roll No. 4406
I.A.S.R.I., Library Avenue, New Delhi-110012
Chairperson: Dr. U.C. Sud
Abstract: Measurement error is defined as the difference between the
STAT 20: Lecture Section 2. Spring 2011 Homework #1
Hand in HW to your GSI at the START of Section on Thursday Feb 10th.
Make sure to put your name, SID, section number, your GSIs name and
section time on the first page. Please staple all the pages togeth
Assignment #9
Pg. 143
#4.) R stays the same even if you double each value of X
Pg. 144
#9.) The person who calculates it for the whole year will have the larger correlation
because of attenuation
Pg. 153
#5, Set E.) No you should not conclude that coffee
STAT 20
Quiz 1
Prof. Fletcher Ibser
SID:
Full Name:
Circle your section:
201. 9-10am Mihn
202. 10-11am Mihn
203. 10-11am Lindsey
204. 11-12pm Lindsey
205. 12-1pm Preet
206. 1-2pm Preet
207. 2-3pm Pooja
208. 3-4pm Pooja
Answer the questions in the spaces p