HW 8
You want to know if indigenous languages are dying but can't do a census because
local populations won't stay put. So you go two towns, Santa Maria del Nieva (has
more outside contact) and Borja (has with less) and measure the percent of people
who s

Test 2 practice
Vocabulary for experiments and surveys
Blocking, Bias, Blind, SRS, Cluster, Stratified. Non response.
More will be added here.
2. You survey 100 people and ask if they like cheese. 73 say yes. Report your
findings with a 95% confidence int

Practice Test 1
Example data summarizing questions
1. What is the median and Q1 and Q3 of the following data
3,6,7, 23 , 87, 2, - 50, 4 , 0
2. What is the mean and standard deviation of the following data
3,3,5,1,0,6
3. What is the correlation of the foll

Example Probability questions
1.
Two cards are draw from one deck randomly. What is the probability you draw
at least one ace of hearts?
P( 0 ace of hearts ) + P( 1 ace of hearts ) + P( 2 ace of hearts ) = 1
P( 0 ace of hearts ) = ( 51 / 52 ) * ( 50 / 51

1. If y = a + b * u and X = c + d * v with a,b,c,d all constants show
correlation( y,x ) = correlation ( u,v )
2. Below is data of age and systolic blood pressure among a random sample of
women near Ames Iowa.
Mean Bloo
d
Age Class, Pressure,
X
Y
35
114
4

Homework 3 Questions 5, 11, 14, and 16 from Chapter 4 and
Questions 1, 7, 15, 24, and 27 from Chapter 5
5a. For this survey, the population is college freshmen, and the sample is
252,082 full-time freshmen at 464 two and four year colleges and
universitie

Homework 7 Chapter 13 - 3, 9, 10, 11, 17, 23 (see question 22 for
the footnote)
3a. There is a relationship between the two variables in the sample
b. That does not necessarily mean there is a relationship between the two
variables in the population
c. It

Kalpana Mohanty
Statistics Homework:
1. Those who are likely to be watching at the end of the show are most
likely those that liked the show and watched till the end of it. Therefor you
would only receive very positive responses. Additionally, because the

STATS REVIEW
1. Assuming there is a statistical relationship between height and weight for adult females,
which of the following statements is true?
a. If we knew a womans height, we could predict her weight.
b. If we knew a womans height, we could determ

Tanya Bhalla
26/01/15
Introduction to Statistical Reasoning
Professor Cohen
Chapter 1: 1,2,5,7,10,16 (Textbook Edition 3)
1. Since this was an at least single-blind experiment, there were proper
methods and precautions taken to ensure that all other varia

Tanya Bhalla
6/02/15
Introduction to Statistical Reasoning
Professor Cohen
Chapter 2: 1, 4, 8, 10, and 16 from Chapter 2 and Questions 24, 20, 5, 14, and 18
from Chapter 3.
Chapter 2:
1) The only people who would call in to either number are those who fee

Tanya Bhalla
15/02/15
Introduction to Statistical Reasoning
Professor Cohen
Homework 3 Questions 5, 11, 14, and 16 from Chapter 4 and Questions 1, 7, 15,
24, and 27 from Chapter 5.
Chapter 4: 5, 11, 14, 16
5) a. A unit is a single individual or object to

Tanya Bhalla
Chapter 8
3.
Intro to Stats Reasoning
a. -0.67
b. 0.67
1/3/15
Homework #5
Guy Cohen
c. -0.13
d. 2.05
5.
a. 0.68
b. 0.86
c. 0.34
8.
a. Z= (X - ) /
Z = (450-497)/ 115
Z = -0.41 percentile is 34 A GRE score of 450 is in the 34th percentile
b. Z

Tanya Bhalla
Homework 12
3rd Edition
CHAPTER 22:
4)a. Null: the calcium and placebo-treated participants came from populations
with equally severe PMS mood swings. Alternative hypothesis: the calcium and
placebo treated participants came from populations

Homework 7
1. Two test methods of curing insomnia researches tried the following experiment.
They got a group of subjects and each night measured how well they slept. Subjects
were given different mattresses (soft, medium, hard), some wine (0,1,2,3 glasse

Introduction to Statistical Reasoning
Syllabus and Description
Ha H. Nguyen
Department of Statistics
Columbia Universitr
[email protected]
Statistics has impact our lives in many waysI in business, nance, sciences. and
medical elds. From newspapers to s

Part W: MAKING IUBGEMENTS FROM SURVEYS AND EXPERIMENTS.
15. The Diversity of Samples from the Same Population
19. Estimating Proportions with Condence.
2B. The Role ofConfidenoe inoervals in Research.
21. Rejecting [lhancenTesting Hypothesis in Research.

8 September 2016
Intro to Statistics Lecture 2
#Topics for today:
-Display quantitative data with 1 variable
-summarizing quantitative data with 1 variable
#How to display quantitative data
1) Stem Leaf
2) Frequency table
3) Histogram (2 & 3 almost the sa

9/6 STAT 1101 Tu. & Tr. 18:10-19:55
602 Hamilton
Text book info: Stats Data and methods. De Veaux
Two exams: 22.5% of grade each one
-Both done by Nov 10th
Final Exam: 35% of grade
-statistical Inference (not cumulative)
Project 10%
-collect data
-analysi

Homework 2 Solution
3. The percentage boxplot has a smaller IQR, the data seem more
concentrate. However, there are more outliers in percentage
boxplot. The percentage boxplot is more important since we are
more concerned about the rate of return of a sto

a) SRS
Suppose there are N dogs. Randomly choose a subset of individuals entirely by chance,
such that each individual has the same probability of being chosen at any stage during the
sampling process. Suppose we choose n dogs, and we find m dogs among th

1. Define x = 1 if your old man has popped opened a few beers and is blasting Special Ed
(success), and x = 0 if your old man hasnt popped opened a few beers and is blasting
Special Ed (failure)
Then P(x = 1) = 0.1, P(x = 0) = 0.9, X ~ Ber(0.1).
2. P(next

1.
Response variable: how well they slept
Factors: 3 (mattresses, wine, exercise)
Levels: 9 total (mattresses has 3 levels; wine has 4 levels, exercise has 2 levels)
Example of an individual treatment: cfw_soft mattress, 0 glasses of wine, exercise (any o