Statistics W1211 Fall 2014
Midterm Exam 2
Answers
1. In a survey of n = 1000 American adults, 248 said the believed in astrology. Calculate and
interpret a 99% condence interval for the proportion of
Introduction to Statistics (with calculus)
Statistics W1211 Fall 2014
Section 002: MW 6:10pm7:25pm; 517 Hamilton
Instructor:
Ronald Neath
[email protected]
Oce hours:
Time and location to be announ
Statistics W1211 Fall 2014
Midterm Exam 1
Answers
1. (5 points) The following density histogram summarizes the distribution of average length of
stay (in days) for a random sample of U.S. hospitals.
0
Introduction to Statistics (with calculus)
Statistics W1211 Fall 2014
Assignment 4
Solutions:
1. Chapter 4 problem 34
Let X denote the substrate concentration (mg/cm3 ) for a random sample of reactor
Introduction to Statistics (with calculus)
Statistics W1211 Fall 2014
Assignment 1
Solutions:
1. Chapter 1 problem 26.
(a) The proportion smaller than 15 is .177 + .166 + .175 = .518 so the assertion
Introduction to correlation and regression
Statistics W1211
Columbia University
Fall 2014
December 8, 2014
1
Bivariate data
A bivariate data set consists of two measurements on each subject.
Data: (x1
Introduction to Statistics (with calculus)
Statistics W1211 Fall 2014
Assignment 7
Solutions:
1. Chapter 8 problem 18.
We have a Normal population with unknown and = 9. We will test the hypotheses
H0
Stat 1201 Hmk #7
Part I
The following questions will be checked for completeness only, as answers are provided in the back of the
textbook. You are encouraged to work with your classmates on these pro
Conditional Probability (2.4)
P(having the disease | positive test)
P(liking Supertramp)
P(liking Supertramp | age 15)
P(liking Supertramp | age 55)
1
Conditional Probability
P(Type I error | H0 i
Introduction to Statistics (with calculus)
Statistics W1211 Fall 2014
Assignment 8
Solutions:
1. Chapter 8 problem 54
If the taster is merely guessing, he or she has a 1/3 chance of correctly identify
Introduction to Statistics (with calculus)
Statistics W1211 Fall 2014
Assignment 9
Solutions:
1. Chapter 2 problem 56
P (A|B) + P (A |B) =
P (B)
P (A B) P (A B)
+
=
=1
P (B)
P (B)
P (B)
2. Chapter 2 p
Introduction to Statistics (with calculus)
Statistics W1211 Fall 2014
Assignment 5
Solutions:
1. Chapter 5 problem 42
(a) We must compute x for each of the
6
2
= 15 possible samples.
Sample
x
probabil
Introduction to Statistics (with calculus)
Statistics W1211 Fall 2014
Assignment 6
Solutions:
1. Chapter 7 problem 12.
In a random sample of size n = 110 we observe sample mean x = 0.81 and standard
d
Introduction to Statistics (with calculus)
Statistics W1211 Fall 2014
Assignment 2
Solutions:
1. Chapter 2 problem 12.
(a) P (A B) = P (A) + P (B) P (A B) = .50 + .40 .25 = .65
(b) P (A B ) = 1 P (A B
UN 1201 HW07 Solutions
8.2
a. Comply.
b. Do not comply. The alternative hypothesis should not include equality.
c. Do not comply. The null hypothesis should not incl
STAT W1211 INTRODUCTION TO STATISTICS SEC 003
Spring 2012
Instructor
Xuan Yang
Oce:
Email:
Oce Hours:
901 SSW, 1255 Amsterdam Ave
[email protected]
4:00-5:00 pm, Thursday
Class Time
1:10 - 2:25 pm,
Non-standard Normal
X is a normally distributed rv with = 50, = 10
What is P(40 X 60)?
P(45 X 55)?
10/17/17
20
Non-standard Normal
X is a normally distributed rv with with = 50, = 10
What is P(40