STAT 201: INTRODUCTION TO BUSINESS STATISTICS
Section 3, Spring 2012-2013
SOLUTIONS TO HOMEWORK # 4
1) a) Using either the uploaded z-table or the NORMSDIST(z) function in excel we get
i) P(z 1.0) = 0.8413 (Directly from the table, or by typing =NORMSDIST
Wentian Su
Com270-007
Prof.Keewan
TO: Bob Morgan, Operations Department
FROM: Vince Sinclair, Design Department
DATE: May 27, 2010
SUBJECT: Proposal for Wheelchair-Lift Switch Covers
PURPOSE
The purpose in submitting this proposal was to insure year-round
STAT 201: INTRODUCTION TO BUSINESS STATISTICS
Section 3, Spring 2012-2013
HOMEWORK # 6
(Due Wednesday, June 5th)
1) Consider the following hypothesis test:
H0: 25
HA: > 25
A sample of 40 provided a sample mean of 26.4. The population standard deviation
is
STAT 201: INTRODUCTION TO BUSINESS STATISTICS
Section 3, Spring 2012-2013
SOLUTIONS TO HOMEWORK # 6
1)
H0: 25
HA: > 25
Given n = 40, x =26.4, =6;
a) z =
x 0
x 0 26.4 25
=
=
= 1.4757
std. err / n
6 / 40
b) The relevant tail is the upper tail. The p-value i
STAT 201: INTRODUCTION TO BUSINESS STATISTICS
Section 3, Spring 2012-2013
SOLUTIONS TO HOMEWORK # 5
1) = 3.518, = 0.20
a) n = 30, x = 3.724. The sampling error is then, x - = 3.724 - 3.518 = 0.206.
b) Since n 30, the central limit theorem applies and imp
STAT 201: INTRODUCTION TO BUSINESS STATISTICS
Section 3, Spring 2012-2013
ADDITIONAL PRACTICE PROBLEMS FOR THE FINAL EXAM
1. Let X be a random variable, characterized by a normal distribution with mean
1000 and standard deviation of 400. Compute the follo
STAT 201: INTRODUCTION TO BUSINESS STATISTICS
Section 3, Spring 2012-2013
SOLUTIONS TO THE PRACTICE PROBLEMS FOR THE FINAL EXAM
1.
a. P(X < 1200) = P (Z < (1200-1000)/400) = P(Z < 0.5) = 0.6915
b. P (200 < X < 800) = P(X<800)-P(X<200) = P(Z< -0.5) P(Z<-2)
24 April 20xx
Stuart Wolfe, M.D.
Vice President and Chair
Hahnemann University Hospital
Department of Nephrology
1505 Race Street, Suite 1610
Philadelphia, PA 19102
Dear Dr. Wolfe:
As you requested, I am writing to you to tell you about my curren